Untitled

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Shift</title>
<script type="text/javascript">
function checkShift(e){
    var m='';
    if(e.shiftKey) m+="Shift нажат!";
    if(e.altKey) m+=" Alt нажат!";
    if(e.ctrlKey) m+=" Ctrl нажат!";
    alert(m);
}
window.onload=function(){
    var el=document.getElementById('src');
    if(el.attachEvent)  el.attachEvent("onclick",function(event){ checkShift(event); });
    else el.addEventListener("click", function(e){ checkShift(e); }, false);
}
</script>
</head>

<body>
<a id="src" href="#" onclick="return false;">Click me</a>
</body>
</html>