/*Function that changes the URLs*/
 
function CalcUrls(cost,order,id){
    if (order == 1) {
            document.images['unstained'].src = "images/checked.gif";
            document.images['stained'].src = "images/box.gif";
            id = id + "u";    
        } else {
          document.images['unstained'].src = "images/box.gif";
          document.images['stained'].src = "images/checked.gif"; 
          id = id + "s";   
        }        
      document.getElementById('next').href="theorderingprocess.php?cubms=50&cost="+ cost + "&id=" +id;  
}