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 validate_dsp_pre() {
var emailID=document.dspcert.ContactEmail	
if ((emailID.value==null)||(emailID.value=="")){
	alert("Please Enter a valid email address.")
	emailID.focus()
	return false
}
if (echeck(emailID.value)==false){
	emailID.value=""
	emailID.focus()
	return false
}
if (document.dspcert.ContactName.value == "") {
alert("Please enter your name.");
document.dspcert.ContactName.focus();
return false;
}
else if (document.dspcert.ContactPhone.value == "") {
alert("Please enter your phone number.");
document.dspcert.ContactPhone.focus();
return false;
}
else if (document.dspcert.ContactCountry.value == "") {
alert("Please enter your country.");
document.dspcert.ContactCountry.focus();
return false;
}
else if (document.dspcert.ContactAffiliation.value == "") {
alert("Please specify whether you have an affiliation with one of the listed organizations.  If you do not have an affiliation, select 'No Affiliation'.");
document.dspcert.ContactAffiliation.focus();
return false;
}
else if (document.dspcert.ContactProfession.checked == false) {
alert("Please describe your profession.");
document.dspcert.ContactProfession.focus();
return false;
}
else {
return true;
} 
}