Function does not exist

I keep getting this error, even though the function does exist! I have

[code]
<script type=”text/javascript”>
function undo(){
alert(“undo”);
//some undo code here
}
</script>
….
<input value=”Undo” name=”undo” onclick=”undo()” type=”button”>
[/code]

When I click the button, I get an error saying function undo does not exist. But if I just call the function immediately after the page loads by putting

[code]
<script>
undo();
</script>
[/code]

At the bottom of my page, the alert box will pop up. I don’t know why clicking the button says the function doesn’t exist.

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