// JavaScript Document
function isNumberKey(evt)
      {
         var charCode = (evt.which) ? evt.which : event.keyCode
			 if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;

         return true;
      }


function isAlpha ( evt ) {
   var keyCode = evt.which ? evt.which : evt.keyCode;
   alpha = ( keyCode >= 'a'.charCodeAt ( ) &&
      keyCode <= 'z'.charCodeAt ( ) ) || 
      ( keyCode >= 'A'.charCodeAt ( ) &&
      keyCode <= 'Z'.charCodeAt ( ) );
   return ( alpha );
}


function isalphnum(evt)
{
	if(isNumberKey(evt) || isAlpha ( evt ))
	{
		return true;
	}
	return false;
}