function ChangeImage(imagename, imageoffset) {
    document.getElementById("ctl00_leftSide_imgProperty").src = imagename;
    document.getElementById("ctl00_leftSide_hidOffset").value = imageoffset;
}

function ShowImage() {
    imagename = document.getElementById("ctl00_leftSide_imgProperty").src;
    imageoffset = document.getElementById("ctl00_leftSide_hidOffset").value;
    document.getElementById("ctl00_leftSide_imgPopup").src = imagename.replace(/w=250/, "w=454").replace(/w=275/, "w=454").replace(/h=180/, "h=280") + "&offset=" + imageoffset;
}