Make sure you're referencing the correct path to the image. Also, here's a better and more accessible way of opening your links in a new window:
Code:
function MM_openBrWindow(theURL,winName,features) { //v2.0
window.open(theURL,winName,features);
}
<a href="images/gallery/gal1/lrg/1957.jpg"
onClick="MM_openBrWindow(this.href,'newWin','width=315,height=215'); return false;">
<img src="images/gallery/gal1/thumbnails/1957_small.jpg" width="100" height="70" border="0"></a>
If your browser supports opening new-window links, the links will now open in a new window. Otherwise, it will open in the same window as a fallback. I also named the new window as "newWin", so other scripts can reference it (for example, if you wanted a link in the parent window to close the pop-up).
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