<script>
function nameoffuction()
{
window.location = 'http://adress'
}
</script>

<a href="javascript:nameoffuction()"><img src="img_adress" border="0"></a>

<script language="JavaScript">
<!--
function openPic(objx) {
window.open(objx.src, 'PopUpImg', 'width='+(objx.width+20)+',height='+(objx.height+30));
}
// -->
</script>
<img src="1.jpg" onClick="openPic(this)">