function openWin(URL){
aWindow=window.open(URL,"test","toolbar=no,width=550,height=400,status=no,scrollbars=no,resize=no,menubar=no");
}



function swap(i)
{
document.center_pic1.src = pic[i];
var w=document.center_pic1.width;
var h=document.center_pic1.height;
}

function back()
{
document.center_pic1.src=pic[1];
}

function preloader() 
{
     // counter     
     var i = 0;     
     for(i=0; i<=pic.lenght; i++) {
       var preload_pic=new Images();
           preload_pic.src=pic[i];     
                         }

}