Need Help with Complex Alert

[Amber]

I want to have a Javascript alert button which allows the surfer to have choices. 'Do you want to download this image, or just see a larger version of this image?' then they can select either 'download' or 'view larger'. How is this accomplished?

[Vladdy]

<div id="customPrompt"
style="position:absolute;top:40%;
height:20%;left:30%;
width:40%;display:none">
<p>put you prompt here</p>
<button onclick="document.getElementById('customPrompt').style.display='none';
doDownload();">Download</button>
<button onclick="document.getElementById('customPrompt').style.display='none';
doLarger();">View Larger</button>
</div>