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 ValidateForm(){
	var emailID=document.emailForm.txtEmail
	
	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
	}
	return true
 }
 
 function ValidateExhibitorForm(){
	var emailID=document.exhibitorForm.exhEmail;
	var nameID=document.exhibitorForm.name;
	var addressID=document.exhibitorForm.address;
	var phoneID=document.exhibitorForm.phone;
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email address")
		emailID.focus()
		return false
	}
	if ((nameID.value==null)||(nameID.value=="")){
		alert("Please enter your name")
		nameID.focus()
		return false
	}
	if ((addressID.value==null)||(addressID.value=="")){
		alert("Please enter your address")
		addressID.focus()
		return false
	}
	if ((phoneID.value==null)||(phoneID.value=="")){
		alert("Please enter your phone number")
		phoneID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }
 
 function ValidateRegistrationForm(){
	var emailID=document.registerForm.exhEmail;
	var nameID=document.registerForm.name;
	var nametagID=document.registerForm.nametag;
	var streetaddressID=document.registerForm.streetaddy;
	var cityaddressID=document.registerForm.city;
	var phoneID=document.registerForm.phone;
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email address")
		emailID.focus()
		return false
	}
	if ((nameID.value==null)||(nameID.value=="")){
		alert("Please enter your name")
		nameID.focus()
		return false
	}
	if ((nametagID.value==null)||(nametagID.value=="")){
		alert("Please enter your name tag preference")
		nametagID.focus()
		return false
	}
	if ((streetaddressID.value==null)||(streetaddressID.value=="")){
		alert("Please enter your street address")
		streetaddressID.focus()
		return false
	}
	if ((cityaddressID.value==null)||(cityaddressID.value=="")){
		alert("Please enter your city")
		cityaddressID.focus()
		return false
	}
	if ((phoneID.value==null)||(phoneID.value=="")){
		alert("Please enter your phone number")
		phoneID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }
 
 
  function ValidateRegistrationForm_staging(){
  	var emailID=document.registerForm.exhEmail;
	var nameID=document.registerForm.name;
	var nametagID=document.registerForm.nametag;
	var streetaddressID=document.registerForm.streetaddy;
	var cityaddressID=document.registerForm.city;
	var phoneID=document.registerForm.phone;
	var number=document.registerForm.conf_number;
		
	if ((number.value==null)||(number.value=="")){
		alert("Please enter your confirmation number")
		number.focus()
		return false
	}
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email address")
		emailID.focus()
		return false
	}
	if ((nameID.value==null)||(nameID.value=="")){
		alert("Please enter your name")
		nameID.focus()
		return false
	}
	if ((nametagID.value==null)||(nametagID.value=="")){
		alert("Please enter your name tag preference")
		nametagID.focus()
		return false
	}
	if ((streetaddressID.value==null)||(streetaddressID.value=="")){
		alert("Please enter your street address")
		streetaddressID.focus()
		return false
	}
	if ((cityaddressID.value==null)||(cityaddressID.value=="")){
		alert("Please enter your city")
		cityaddressID.focus()
		return false
	}
	if ((phoneID.value==null)||(phoneID.value=="")){
		alert("Please enter your phone number")
		phoneID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	
	return true
 }
 
 
 
  function ValidatePressForm(){
	var emailID=document.pressForm.exhEmail;
	var nameID=document.pressForm.name;
	var contactID=document.pressForm.contactinfo;
	var useofinfoID=document.pressForm.useofinfo;
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email address")
		emailID.focus()
		return false
	}
	if ((nameID.value==null)||(nameID.value=="")){
		alert("Please enter your name")
		nameID.focus()
		return false
	}
	if ((contactID.value==null)||(contactID.value=="")){
		alert("Please enter your contact info")
		contactID.focus()
		return false
	}
	if ((useofinfoID.value==null)||(useofinfoID.value=="")){
		alert("Please enter how you are going to use our press materials")
		useofinfoID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }