//to check whether field is empty
function IsEmpty(aTextField) 
{
   if ((aTextField.value.length==0) || (aTextField.value==null)) 
   {
      return true;
   }
   else 
   { 
   	  return false; 
	}
}	

//to check whether field is numeric
function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
}



//check whether field is proper email format
function isEmail(inp) {
         var val = inp.value;
         var re=/^(\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+);?(\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+)*$/;

         if (val.search(re)!=-1)
                 return true;
         else {
                 return false;
        }
}