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("Email address field appears to be invalid. Please check again...")
	 document.enquiry.strEmail.focus();
     return false
  }
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
     alert("Email address field appears to be invalid. Please check again...")
	  document.enquiry.strEmail.focus();
     return false
  }
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
      alert("Email address field appears to be invalid. Please check again...")
	   document.enquiry.strEmail.focus();
      return false
  }
   if (str.indexOf(at,(lat+1))!=-1){
      alert("Email address field appears to be invalid. Please check again...")
	   document.enquiry.strEmail.focus();
      return false
   }
   if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
      alert("Email address field appears to be invalid. Please check again...")
	   document.enquiry.strEmail.focus();
      return false
   }
   if (str.indexOf(dot,(lat+2))==-1){
      alert("Email address field appears to be invalid. Please check again...")
	   document.enquiry.strEmail.focus();
      return false
   }
   if (str.indexOf(" ")!=-1){
      alert("Email address field appears to be invalid. Please check again...")
	  document.enquiry.strEmail.focus();
      return false
   }
   return true          
}



   function checkitem(frm)
   {
		    var emailID=document.frm.strEmail;
			var lastName=document.frm.strLastName;
		
			   if(lastName.value=="")
			{
		
				alert("Last name field is mandatory.");
				lastName.focus();
				return false;
			}
		
		
			
			 if(emailID.value=="")
			{
		
				alert("Email address field is mandatory.");
				emailID.focus();
				return false;
			}
			
   
  
  
  if ((emailID.value==null)||(emailID.value=="")){
    alert("Email address field is mandatory.");
    emailID.focus();
    return false;
  }
  if (echeck(emailID.value)==false){
    emailID.value="";
    emailID.focus();
    return false;
  }
  return true;
 }