// null checking code ------------------------------------

function check(val)
  {
  
     
     if(val.length==0)
	 {
	     return false;
	   }
	  else
	  {
	     return true;
		}
  }


//email address validattion----------------------------------------
function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
if (apos<1||dotpos-apos<2) 
  {alert(alerttxt);return false;}
else {return true;}
}
}