if(navigator.appVersion.charAt(0) >= 3) {
var img = new Array();

img[1] = new Image();  img[1].src="../img/top.gif"; 
img[2] = new Image();  img[2].src="../img/top_on.gif"; 
img[3] = new Image();  img[3].src="../img/info.gif"; 
img[4] = new Image();  img[4].src="../img/info_on.gif"; 
img[5] = new Image();  img[5].src="../img/course.gif"; 
img[6] = new Image();  img[6].src="../img/course_on.gif"; 
img[7] = new Image();  img[7].src="../img/schedule.gif"; 
img[8] = new Image();  img[8].src="../img/schedule_on.gif"; 
img[9] = new Image();  img[9].src="../img/procedure.gif"; 
img[10] = new Image();  img[10].src="../img/procedure_on.gif"; 
img[11] = new Image();  img[11].src="../img/exami.gif"; 
img[12] = new Image();  img[12].src="../img/exami_on.gif"; 
img[13] = new Image();  img[13].src="../img/voice.gif"; 
img[14] = new Image();  img[14].src="../img/voice_on.gif"; 
img[15] = new Image();  img[15].src="../img/result.gif"; 
img[16] = new Image();  img[16].src="../img/result_on.gif"; 
img[17] = new Image();  img[17].src="../img/guid.gif"; 
img[18] = new Image();  img[18].src="../img/guid_on.gif"; 
img[19] = new Image();  img[19].src="../img/claim.gif"; 
img[20] = new Image();  img[20].src="../img/claim_on.gif"; 



}
function change_image(nam,num) {
  if(navigator.appVersion.charAt(0) >= 3) {
    document.images[nam].src = img[num].src;
  }
}