// JavaScript Document
function IsEmpty(a) {
   if ((a.value.length==0) ||
   (a.value==null)) {
      return true;
   }
   else { return false; }
}	



function checkformdsl ( form )
{
	var mesg ="";
	
   if(IsEmpty(form.npa)) 
   { 
      alert('Please enter an area code') ;
      return false; 
   } 
   
   if(IsEmpty(form.nxx)) 
   { 
      alert('Please enter a prefix') ;
      return false; 
   } 
   if(IsEmpty(form.line)) 
   { 
     alert('Please enter a number') ;
      return false; 
   } else  {
	   return true;
	}
   
}