How to call a dll function in html

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C#

VB

Javascript

HTML

gadgets

Hi, I am trying to call a function of my dll , by the ActiveXObject my code works when i open the html file in IE (browser) but when i use that html file (for gadget development ) it return object error. here is the code for calling dll fuction

<script type ="text/javascript">
function myload()
{
try
{
    var myAx = new ActiveXObject("myadd.AddClass");
    var t = document.getElementById("text1");
    t.value = myAx.add(2,2);

}
catch(e)
{
var textbox = document.getElementById("text1");
    textbox.value = e;
}
}
</script>

Does ActiveXObject works in gadgets ? and if it does place point out my mistake .
Please also guide how to develop gadgets in C# using dll