[jQuery] Submit button usage for SimpleModal - what am I missing?

[Codemonkey]

Hi,

I am using SimpleModal, and would like to fire a modal on the click of
an input button. When the function fires, it flashes the modal for a
brief moment and then dissapears... can anyone give me a hand?

It's pretty basic:
<input name="button1" type="image" onclick="$('#myDiv').modal
('test');" value="Calculate" src="calc/images/Calculate_btn.gif" />

Any ideas?

Apologies if this is not where to post to...