MediaWiki:Vector.js

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function columnAreaImage(){
    if(document.title.split(" ")[0] == "Preferences")
    {
        return;
    }
 
    var divS;
    if (document.getElementById ) {
        divS = document.getElementById("column-content");
    } else if (document.all ) {
        divS = document.all["column-content"];
    } else {
        return;
    }
    if ( divS && divS.style ){
        var divSHval;
        if (divS.style.pixelHeight) { 
            divSHval= divS.style.pixelHeight;
        } else {
            divSHval=  divS.offsetHeight;
        }
 
        if(Number(divSHval) >1176){
        //1136=768(number bigger than background image and side buttons)+imgheight(370)
            divS.style.backgroundImage = "url(/images/a/aa/VectorSidebarInfosphere.png)";
            divS.style.backgroundPosition = "bottom left";
            divS.style.backgroundRepeat = "no-repeat";
            
        }
    }
}
 
addOnloadHook(columnAreaImage);