/**********************************************************************
 section 1 - form validation
 **********************************************************************/
	

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail Address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail Address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

 		 return true					
	}


function isNumeric(zipcheck){
	var numericExpression = /(^\d{5}$)|(^\d{5}-\d{4}$)/;
	if(zipcheck.match(numericExpression)){
	return true;
	
	}
	
	else{
		alert("Invalid Zip Code");
		return false;
	}
}


function ValidateForm(){
	var emailID=document.gcn.email
	var zipID=document.gcn.zip
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email Address")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	if ((zipID.value==null)||(zipID.value=="")){
		alert("Please Enter your Zip Code")
		zipID.focus()
		return false
	}
	if (isNumeric(zipID.value)==false){
		zipID.value=""
		zipID.focus()
		return false
	}
	return true
 }