set the width and height of jquery popup large images

set the width and height of jquery popup large images

I have used a jquery popup gallery for my website where I want to set the
resizable image to some fixed height and width. I cant get the exact code
here is my code for the gallery
<script type="text/javascript" src="javascripts/top_up-min.js"></script>
<script type="text/javascript">
TopUp.addPresets({
"#images a": {
fixed: 0,
group: "images",
modal: 0,
title: "gallery"
},
"#movies": {
resizable: 0
}
});
</script>
and code for images in body part
<span id="images">
<a href="images/photos/1.jpg" toptions="overlayClose = 1">
<img src="images/thumbnails/1.jpg"/>
</a>
<a href="images/photos/1.jpg" toptions="overlayClose = 1">
<img src="images/thumbnails/1.jpg"/>
</a>
</span>