function setMainImageSrc(newSrc,currentImageUrlRef){    
    mainImgElmnt = document.getElementById("mainimage");
    mainImgElmnt.src = newSrc;
    currentImageUrl = currentImageUrlRef;
}

function openWindow(winUrl,winName,winFeatures) {
    var winToOpen=window.open(winUrl,winName,winFeatures);
    winToOpen.focus();
}