function on(obj,imm)
{
   if (imm != "tit4") obj.style.background = "#fff url(images/angle.gif) no-repeat 100% 100%";
   else obj.style.background = "#fff url(images/angle2.gif) no-repeat 0 100%";
   obj.style.color = "#1E6462";
   myImg = document.images[imm];
   myImg.src = "images/" +imm + "_on.gif"
}
function off(obj,imm)
{
   obj.style.background = "#adadad";
   obj.style.color = "#fff";
   myImg = document.images[imm];
   myImg.src = "images/" +imm+ "_off.gif"
}

function preload()
{
   tit1_on = new Image();
   tit1_on.src = "images/tit1_on.gif";
   tit2_on = new Image();
   tit2_on.src = "images/tit2_on.gif";
   tit3_on = new Image();
   tit3_on.src = "images/tit3_on.gif";
   tit4_on = new Image();
   tit4_on.src = "images/tit4_on.gif";
   angle_on = new Image();
   angle_on.src = "images/angle.gif";
   angle2_on = new Image();
   angle2_on.src = "images/angle2.gif";
}