function checkEmail(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("please enter a valid email address")
			return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
			alert("please enter a valid email address")
			return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
			alert("please enter a valid email address")
			return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
			alert("please enter a valid email address")
			return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
			alert("please enter a valid email address")
			return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
			alert("please enter a valid email address")
			return false
		 }
		
		 if (str.indexOf(" ")!=-1){
			alert("please enter a valid email address")
			return false
		 }

 		 return true					
}


function validateEBanner(eform)
{
	//validate email
	if (! checkEmail(eform.Email.value))
	{
		eform.Email.focus();
		return false;
	}
	// check for zip code
	else if (eform.OptionalParameter4.value == "Zip Code") 
	{
		eform.OptionalParameter4.value = "";
	}
	return true;
		
}