document.onkeyup = KeyCheck; 
function KeyCheck(e)
{
var KeyID = (window.event) ? event.keyCode : e.keyCode;
if(KeyID==13)
{
document.getElementById($("[id*='ff']").attr('id')).disabled=true;
document.getElementById($("[id*='savebutton']").attr('id')).focus();
document.getElementById($("[id*='savebutton']").attr('id')).click();
document.getElementById($("[id*='ff']").attr('id')).disabled=false;
}
}