1. <script>
function dosomething() {
alert(window.event.srcElement.value);
}</script>
<form name="form1"><input type="checkbox" name="checkbox1" onclick="dosomething()"></form>
2. <script>
function dosomething(obj) {
alert(obj.value);
}
</script>
<form name="form1"><input type="checkbox" name="checkbox1" onclick="dosomething(this)"></form>
function dosomething() {
alert(window.event.srcElement.value);
}</script>
<form name="form1"><input type="checkbox" name="checkbox1" onclick="dosomething()"></form>
2. <script>
function dosomething(obj) {
alert(obj.value);
}
</script>
<form name="form1"><input type="checkbox" name="checkbox1" onclick="dosomething(this)"></form>
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/dhtmlrefs.aspevent Object in particular:
http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/obj_event.asp?frame=true