function preload(name, first, second) {  

  if (browserOK) {     
    pics[objCount] = new Array(3);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;
  }
}


function on(name){
        if (browserOK) {
                for (i = 0; i < objCount; i++) {
                	if (document.images[pics[i][2]] != null) {
						if (document.images[pics[i][2]].src != pics[i][1].src) {
							if (name != pics[i][2]) { 
									document.images[pics[i][2]].src = pics[i][0].src;
							} 
							else {
									document.images[pics[i][2]].src = pics[i][1].src;
							}
						}
         			 }
       			 }
   		 }		 
}

function off(){
        if (browserOK) {
                for (i = 0; i < objCount; i++) {
					if(i!=akt){
                        if (document.images[pics[i][2]] != null) {
                                        document.images[pics[i][2]].src = pics[i][0].src;
                        }
					}
					else{
					    if (document.images[pics[i][2]] != null) {
                                        document.images[pics[i][2]].src = pics[i][1].src;
                        }
					}
                }
        }
}


preload("link1", "images/oben4.gif", "images/oben4_over.gif");
preload("link2", "images/oben5.gif", "images/oben5_over.gif");
preload("link3", "images/oben6.gif", "images/oben6_over.gif");
preload("link4", "images/drucker.gif", "images/drucker_over.gif");
preload("link5", "images/unternehmen.gif", "images/unternehmen_over.gif");
preload("link6", "images/referenz.gif", "images/referenz_over.gif");
preload("link7", "images/dienstl.gif", "images/dienstl_over.gif");
preload("link8", "images/wissen.gif", "images/wissen_over.gif");
preload("link9", "images/projekt.gif", "images/projekt_over.gif");
preload("link10", "images/job.gif", "images/job_over.gif");