I have a matrix of checkboxes and I would like to get the id of the checkBox on which the mouse is over. I set the onMouseOver handler programmatically by the following C# code in the Page_Load procedure:

checkBoxObject.Atributes.Add("onMouseOver","mouseO verHandler(this)")

The client's MouseOverHandler function (JavaScript) is:

Function mouseOverHandler(me)
{
alert(document.getElementById(me.id))
}

When I move the mouse over a checkbox I get an empty alert box. It seems that the function "mouseOverHandler " does not get the firing checkbox in the parameter"me".

The same code works correctly when I change the triggering event from "onMouseOver" to "onClick".
1. Why does it work with "onClick" and dose not work with "onMouseOver"
2. How can I make it to work with "onMouseOver"
Thank you
Hezi

You are programming your javascript as if it were the code behind. You pass the object, but javascript does not know what .id is. I would just simply pass the ClientID of the checkbox to your js functions.