// JavaScript Document
function check_blank(elt,msg)
{
  if (elt.value=="")
   {
    alert("you cant not left "+msg+" blank");
	alert(aa);
	elt.focus();   
   }
return true;
}


//*******************************************************
/*

<input name="username" type="text"  id="username"  onBlur="return check_blank(this,'username');">

*/
//*******************************************************



function num_check(elt,msg)
{
  if(isNaN(elt.value)== true)
     {
       alert("Enter "+msg+" in Numeric only");
	   elt.value="";
	   elt.focus();   
     }
return true;
}