function change_img(name, flag) {
    if(flag == "on") {
        document.getElementById(name).src = "img/menu_"+name+"1.gif";
    } else {
        document.getElementById(name).src = "img/menu_"+name+".gif";
    }
}

function centerwind(url, w, h, name, scroll) {
   if (w+40 >= window.screen.Width) 
       w = window.screen.Width-40;
   if (h+100 >= window.screen.Height) 
       h = window.screen.Height-100;
   var left=Math.floor((window.screen.Width-w-50)/2);
   var top=Math.floor((window.screen.Height-h-50)/2);
   if (scroll == 1) {
       scroll = ', scrollbars=yes';
   }
   window.open(url, name, 'width='+w+', height='+h+', left='+left+', top='+top+scroll);
}


function switch_select(id) {
   if(id == 1) {
        document.getElementById("select2").style.display = "none";
        document.getElementById("select1").style.display = "block";
   } else {
        document.getElementById("select1").style.display = "none";
        document.getElementById("select2").style.display = "block";
   }
}