//check required fields
	function checkLength1(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req1").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req1").style.display = "none";
			return 0;
		}
	}

	function checkLength2(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req2").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req2").style.display = "none";
			return 0;
		}
	}
	
	function checkLength3(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req3").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req3").style.display = "none";
			return 0;
		}
	}
	
	function checkLength4(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req4").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req4").style.display = "none";
			return 0;
		}
	}
	
	function checkLength5(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req5").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req5").style.display = "none";
			return 0;
		}
	}
	
	function checkLength6(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req6").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req6").style.display = "none";
			return 0;
		}
	}
	
	function checkLength7(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req7").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req7").style.display = "none";
			return 0;
		}
	}
	
	function checkLength8(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req8").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req8").style.display = "none";
			return 0;
		}
	}
	
	function checkLength9(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req9").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req9").style.display = "none";
			return 0;
		}
	}
	
	function checkLength10(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req10").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req10").style.display = "none";
			return 0;
		}
	}
	
	function checkLength11(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req11").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req11").style.display = "none";
			return 0;
		}
	}
	
	function checkLength12(data, element){
		var length = data.length;
		if(length < 1){
			document.getElementById("error_req12").style.display = "block";
			return 1;
		} else {
			document.getElementById("error_req12").style.display = "none";
			return 0;
		}
	}
	

//check form
	function checkForm(){
		var reqFields = document.addStudent.req.value;
		var email = document.addStudent.email.value;
		
		var testReqFields1 = checkLength(req1, "req1");
		var testReqFields2 = checkLength(req2, "req2");
		var testReqFields3 = checkLength(req3, "req3");
		var testReqFields4 = checkLength(req4, "req4");
		var testReqFields5 = checkLength(req5, "req5");
		var testReqFields6 = checkLength(req6, "req6");
		var testReqFields7 = checkLength(req7, "req7");
		var testReqFields8 = checkLength(req8, "req8");
		var testReqFields8 = checkLength(req9, "req9");
		var testReqFields8 = checkLength(req10, "req10");
		var testReqFields8 = checkLength(req11, "req11");
		var testReqFields8 = checkLength(req12, "req12");
		
		var testTotal = testReqFields1 + testReqFields2 + testReqFields3 + testReqFields4 + testReqFields5 + testReqFields6 + testReqFields7 + testReqFields8 + testReqFields9 + testReqFields10 + testReqFields11 + testReqFields12;
		
		if(testTotal > 0){
			return false;
		}
	}