Asp.NET and C# problem, checkbox to enable a button dynamically. Help.?

I have a button which i want to enable when a checkbox is checked. I did it successfully by setting the AutoPostBack of the checkbox to true, when i check it, the page reloads and the button is enabled. But the problem is I want to do this without the page being reloaded. Is there a way to do it without the use of javascript?

I tried creating a javascript function as follows:
<script language="javascript">
function EnableButton(obj) {
document.getElementById('<%=btnNext.ClientID%>').disabled=!obj.checked; }
</script>

and i called this function "EnableButton" on my aspx source page on the Checkbox property adding "oncheckedboxchanged="EnableButton" I don't see anything wrong here but when compiling it says "register.aspx does not contain a definition for 'EnableButton'

where am i going wrong?
any help would be appreciated
thanks, i did it finally and i didn't have to use ClientID or anything. i just used the control names. long story. thanks again :)
 
There is only one way to do this, that is using javascript which does not requires page reload.
You cannot direct drop script tag as in HTML page, there is a different way of adding javascript to aspx page.
 
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