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function fun1(){
alert("F2");
}
function fun2(){
alert("Other key");
}
function document.onkeydown(){
if(event.keyCode == 113)
{
fun1();
}else{
fun2();
}
}
<div id="div1" style="margin: 20px; width: 100px; padding: 10px; height: 100px; border: 5px solid #ccc">
</div>
<script type="text/javascript">
var i = 1;
var div = document.getElementById("div1");
if (i == 0) {
div.onmouseover = function() { alert("i=0"); }
} else {
div.onmouseover = function() { alert("i!=0"); }
}
</script>
if(event.keyCode == 13)
{ return false;
}