$(function(){
    var divElem = $("#content_right");
    var maxht = divElem.height();
    var maxwdt = divElem.width();
    var imgElem = $("#content_right img");
    var ht = imgElem.height();
    var wdt = imgElem.width();
    var maxwidth = '100px'
    if (ht < wdt){
        if (wdt > maxwdt)
            $("#content_right img").css({'height' : "auto", 'width' : wdt});
    }
});