var vers = navigator.appVersion;
var nr_current = 1;

function pic_scroll(scroll_nr){
        var picObject = document.getElementById("img_"+(nr_current+scroll_nr));
            if (vers.indexOf("MSIE") != -1) {
                if (picObject == "[object]"){
               	 	nr_current = nr_current+scroll_nr;
               	 	pic_click(nr_current);
                }
             } else {
                if (picObject == "[object HTMLImageElement]"){
                	nr_current = nr_current+scroll_nr;
                	pic_click(nr_current);
                }
            }
        }
       
function pic_click(nr_select){
			nr_current = nr_select;
        	var sourcePic = document.getElementById("img_"+nr_select);
        	var stagePic = document.getElementById("img");
        		stagePic.src = sourcePic.src;
        }