// JavaScript Document
var intLimitInf = 0;
var intLimitSup = 0;
var intImageHeight = 0;
var relativeRest = 0;

function moveImage() {
    /*x = scrollingDetector()+intLimitInf;
    if(x > intLimitSup)
        x = intLimitSup;*/
    y = document.viewport.getScrollOffsets().top-relativeRest;
    h = document.viewport.getHeight();

    y += (h - (intImageHeight))/2;

    if(y<intLimitInf)
        y = intLimitInf;

    $("idImage").setStyle({
       top:y+"px"
    });

}
function createMoveImage(intLInf,imgH,relativeRest) {
    //intLimitSup = intLSup;
    intLimitInf = intLInf;
    intImageHeight = imgH;
    if(relativeRest != null)this.relativeRest = relativeRest;
    setInterval(moveImage, 200);
}

function scrollingDetector(){
if (navigator.appName == "Microsoft Internet Explorer")
    return document.body.scrollTop;
else
    return window.pageYOffset;
}