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("E-mail not in correct format.")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("E-mail not in correct format.")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("E-mail not in correct format.")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("E-mail not in correct format.")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("E-mail not in correct format.")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("E-mail not in correct format.")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("E-mail not in correct format.")
		    return false
		 }

 		 return true					
 }

function SubmitEmail (theForm) 
{
var formOK = true;

	if(theForm.email_address.value == "")
	{
		alert("Please enter your email address.");
return (false);
	}
var check=echeck(theForm.email_address.value);
if (check== false)
	{
	return (false);
	}		
}