function visa(obj) {

   if(obj.style.display=='none') {
   obj.style.display='block'
   }

}

function dolj(dolja) {

   dolja.style.display='none'

}

function uvisa1(obj) {
   obj.style.display='block'
   document.all.a1.style.display='block'
}
function udolj1(dolja) {
   dolja.style.display='none'
   document.all.a1.style.display='none'
}

function uvisa2(obj) {
   obj.style.display='block'
   document.all.a2.style.display='block'
}
function udolj2(dolja) {
   dolja.style.display='none'
   document.all.a2.style.display='none'
}

function uvisa3(obj) {
   obj.style.display='block'
   document.all.a3.style.display='block'
}
function udolj3(dolja) {
   dolja.style.display='none'
   document.all.a3.style.display='none'
}

function uvisa4(obj) {
   obj.style.display='block'
   document.all.a4.style.display='block'
}
function udolj4(dolja) {
   dolja.style.display='none'
   document.all.a4.style.display='none'
}

function uvisa5(obj) {
   obj.style.display='block'
   document.all.a5.style.display='block'
}
function udolj5(dolja) {
   dolja.style.display='none'
   document.all.a5.style.display='none'
}

function NewWindow(mypage, myname, w, h, scroll) {
var winl = (screen.width - w - 40);
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+', left='+winl+',scrollbars='+scroll+',resizable'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}