document.onkeypress = keyPress;
var count = 1;
function keyPress( e ) {
if ( typeof ( window.event ) == "undefined" ) 
k = e.which;
else k = window.event.keyCode;
if ( k == 13 && typeof ( window.event ) == "undefined" )
{
   return false;
} else if ( k == 13 ) {
   event.returnValue=false;
   event.cancel = true;
}
}