function emailCheck(emailString)
{
		var at="@"
		var period="."
		var atLocation=emailString.indexOf(at)
		var stringLocation=emailString.length
		
		if (emailString.indexOf(at)==-1)
		{
		   alert("Please enter a valid email address")
		   return false
		}

		if (emailString.indexOf(at)==-1 || emailString.indexOf(at)==0 || emailString.indexOf(at)==stringLocation)
		{
		   alert("Please enter a valid email address");
		   return false;
		}

		if (emailString.indexOf(period)==-1 || emailString.indexOf(period)==0 || emailString.indexOf(period)==stringLocation)
		{
		   alert("Please enter a valid email address");
		   return false;
		}

		if (emailString.indexOf(at,(atLocation+1))!=-1)
		{
		   alert("Please enter a valid email address");
		   return false;
		}

		if (emailString.substring(atLocation-1,atLocation)==period || emailString.substring(atLocation+1,atLocation+2)==period)
		{
		   alert("Please enter a valid email address");
		   return false;
		}

		if (emailString.indexOf(period,(atLocation+2))==-1)
		{
		  alert("Please enter a valid email address");
		   return false;
		}
		
		if (emailString.indexOf(" ")!=-1)
		{
			alert("Please enter a valid email address");
			return false;
		}	

 		return true					
	}
	

function ValidateEmail(thisForm, emailElementNum)
{

	var emailElement = document.forms[thisForm].elements[emailElementNum];

	if ((emailElement==null)||(emailElement.value==""))
	{
		alert("Please enter an email address");
		emailElement.focus();
		return false;
	}
	if (emailCheck(emailElement.value)==false)
	{
		emailElement.value="";
		emailElement.focus();
		return false;
	}
	return true
 }
 
 
 /* <form  onSubmit="return ValidateForm(0,0)"> */