function thum_over(unitid){
if (document.layers){

}
else{
document.getElementById('thum'+unitid).style.background= "url(images/thum_over.gif)";
}
}

function thum_out(unitid){
if (document.layers){

}
else{
document.getElementById('thum'+unitid).style.background = "url(images/thum.gif)";

}
}

function thumclick(link){
location.href = link;
}