<!--
function hide_right() {
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 document.right_ad.visibility="hide"
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    else if (document.all) {
 document.getElementById("right_ad").style.display="none";
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}
function hide_left() {
    if (document.layers) {
 document.left_ad.visibility="hide"
    }
    else if (document.all) {
 document.getElementById("left_ad").style.display="none";
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}
//-->