<form id="fm" name="thef" method="get">
<input type="text"/>
<input id="sub" type="submit" value="submit">
</form>
<script type="text/javascript">
window.onload=function(){
var form1=document.forms['thef'];
var sub=document.getElementById("sub");
form1.onsubmit=function(evt){
var e=evt||window.event;
e.preventDefault();
}
sub.onclick=function(evt){
var e=evt||window.event;
e.preventDefault();
}
document.onkeydown=function(evt){
var e=evt||window.event;
if(e.ctrlKey && e.keyCode==13){
form1.submit();
}
}
}
</script>