html: onkeydown="return contactFilter(this,document.getElementById('contactsTable'),event);"

javascript :

function contactFilter(textFilter,contactsTable,key){
	var kc = parseInt(key.keyCode);
	if (kc  == 13){
		alert('enter');
		return false;
	}
	else {
		alert('not enter');
		return true;
	}
}