function validate_email(field,alerttxt){
	with (field){
		if (value==null||value==""){
			return true			
		}
		else{
			apos=value.indexOf("@")
			dotpos=value.lastIndexOf(".")
			if (apos<1||dotpos-apos<2){
				alert(alerttxt);
				return false
			}
			else {
				return true
			}

		}
	}
}

function validate_required(field,alerttxt){
	with (field){
		if (value==null||value==""){
			alert(alerttxt);
			return false
		}
		else {
		return true
		}
	}
}

function validate_select(field,alerttxt){
	with (field){
		if (value==null||value=="0"){
			alert(alerttxt);
			return false
		}
		else {
		return true
		}
	}
}
function validate_numbers_only(text,alerttxt) {
   var validChars = "0123456789.";
   var validate_numbers_only=true;
   var c;
 
   for (i = 0; i < text.length && validate_numbers_only == true; i++){ 
      c = text.charAt( i ); 
      if (validChars.indexOf(c) == -1) {
			alert(alerttxt);
			return false;
	}
  }	
  return true
}
function validate_numbers_only1(text,alerttxt) {
   var validChars = "0123456789 -().";
   var validate_numbers_only=true;
   var c;
 
   for (i = 0; i < text.length && validate_numbers_only == true; i++){ 
      c = text.charAt( i ); 
      if (validChars.indexOf(c) == -1) {
			alert(alerttxt);
			return false;
	}
  }	
  return true
}
function validate_phone_number1(field,alerttxt) {
	with (field){
		if (value==null||value==""){
			return true			
		}
		else{
			var validChars = "0123456789 -().";
   			var c;
 
   			for (i = 0; i < value.length; i++){ 
      			c = value.charAt( i ); 
      			if (validChars.indexOf(c) == -1) {
					alert(alerttxt);
					return false;
				}
  			}	
  			return true
		}
	}	
}


//function validate_gpa_field(field,alerttxt) {
//	with (field){
//			
//			var validChars = "0123456789";
//			if (value.length<20)
//			{
//				alert(alerttxt);
//				return false;
//			}
//			
//			else {
//				alert(alerttxt);
//				return true;
//
//			}
//	}	
//}

//   			var c;

//   			for (i = 0; i < value.length; i++){ 
//      			c = value.charAt( i ); 
//      			if (validChars.indexOf(c) == -1) {
//					alert(alerttxt);
//					return false;
//				}
//  			}	
//  			return true

var dtCh= "-";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm-dd-yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}
 
function validate_form(thisform){
	with (thisform){
	//This is the Student Information
		if (validate_select(title,"The 'title' dropdown is empty. Please select the correct title.")==false){
			title.focus();
			return false
		}		
		if (validate_required(firstName,"The 'first Name' field is empty. Please fill out this field.")==false){
			firstName.focus();
			return false
		}
		if (validate_required(lastName,"The 'Last Name' field is empty. Please fill out this field.")==false){
			lastName.focus();
			return false
		}
		if (validate_required(address,"Please fill the 'address', the fill is empty.")==false){
			address.focus();
			return false
		}
		
		if (validate_required(email,"The 'Email' field is empty. Please fill out this field.")==false){
			email.focus();
			return false
		}
		
		if (validate_email(email,"The 'Email address' you wrote is not valid. Please check this field.")==false){
			email.focus();
			return false
		}
		
		if (validate_required(city,"The 'City' field is empty. Please fill out this field.")==false){
			city.focus();
			return false
		}
		if (validate_select(state,"The 'State' dropdown is empty. Please select a state.")==false){
			state.focus();
			return false
		}
		if (validate_required(zipCode,"The 'Zip Code' field is empty. Please fill out this field.")==false){
			zipCode.focus();
			return false
		}
		if (!validate_numbers_only(thisform.zipCode.value,"The 'Zip Code' is invalid, please input numbers only.")){
			thisform.zipCode.focus();
			return false;
		}
		
		if (validate_required(homePhone,"The 'Home Phone Number' field is empty. Please fill out this field.")==false){
			homePhone.focus();
			return false
		}
		if (!validate_numbers_only1(thisform.homePhone.value,"The 'Home Phone Number' is invalid, please input a valid phone number.")){
			thisform.homePhone.focus();
			return false;
		}
		
		if (!validate_phone_number1(workPhone,"The 'work Phone' is invalid. Please Enter a valid work Number.")){
			thisform.workPhone.focus();
			return false;
		}
		
		if (!validate_phone_number1(fax,"The 'fax' is invalid. Please Enter a valid fax Number.")){
			thisform.fax.focus();
			return false;
		}
		if (validate_phone_number1(mobilePhone,"The 'Mobile Phone Number' is invalid. Please Enter a valid Phone Number.")==false){
			thisform.mobilePhone.focus();
			return false;
		}
		if (validate_required(emergencyPhone,"The 'Emergency Phone Number' field is empty. Please fill out this field.")==false){
			emergencyPhone.focus();
			return false
		}
		if (!validate_numbers_only1(thisform.emergencyPhone.value,"The 'Emergency Phone Number' is invalid, please input a valid phone number.")){
			thisform.emergencyPhone.focus();
			return false;
		}
		if (validate_select(schoolName,"The 'School' dropdown is empty. Please select the School.")==false){
			schoolName.focus();
			return false
		}
		if (validate_required(dateOfBirth,"The 'Date of Birth' field is empty. Please fill out this field.")==false){
			dateOfBirth.focus();
			return false
		}
		if (isDate(dateOfBirth.value)==false){
			dateOfBirth.focus();
			return false
		}
		if (validate_required(gpa,"The 'GPA' field is empty. Please enter a GPA (ex: 3.00)")==false){
			gpa.focus();
			return false
		}
		
		
		
//		if (validate_gpa_field(gpa,"The 'GPA' field is invalid, please input a valid GPA.")==false){
//			thisform.gpa.focus();
//			return false;
//		}
		
		
		
		
		if (validate_select(degree,"The 'degree' dropdown is empty. Please select the correct degree.")==false){
			degree.focus();
			return false
		}
		if (validate_select(classStatus,"The 'Class Status' dropdown is empty. Please select the correct Class Status.")==false){
			classStatus.focus();
			return false
		}
		if (validate_select(citizenship,"The 'Citizenship Status' dropdown is empty. Please select the correct citizenship status.")==false){
			citizenship.focus();
			return false
		}
		if (validate_select(major,"The 'Major' dropdown is empty. Please select the correct Major.")==false){
			major.focus();
			return false
		}
		if (validate_select(ethnicity,"The 'ethnicity' dropdown is empty. Please select the correct one.")==false){
			ethnicity.focus();
			return false
		}
		if (validate_select(expectedGraduationDate,"The 'expected Graduation Date' dropdown is empty. Please select the correct expected Graduation Date.")==false){
			expectedGraduationDate.focus();
			return false
		}
//		if (validate_select(jobType,"The 'Job Type' dropdown is empty. Please select the correct Job Type.")==false){
//			jobType.focus();
//			return false
//		}
	//	if (validate_required(doc,"Please browse your resume from your computer.")==false){
	//		doc.focus();
	//		return false
	//	}
 //end check
	}
	
	
}