versOk = (((navigator.appName == "Netscape")&& 
            (parseInt(navigator.appVersion) >= 3)) ||
        
           ((navigator.appName == "Microsoft Internet Explorer")&&
            (parseInt(navigator.appVersion)>=4))
          );


function change_iframe(iframe_id)
{

ns=navigator.appName==("Netscape");
ns4=(ns &&(navigator.appVersion.indexOf("4.")!=-1));
ns5=(navigator.vendor==("Netscape6") || navigator.product==("Gecko"));
ie=(navigator.appName.toLowerCase().indexOf("microsoft")>-1);
ie5=(navigator.appVersion.toLowerCase().indexOf("msie 5.")!=-1);
ie6=(navigator.appVersion.toLowerCase().indexOf("msie 6.")!=-1);
// mac=(navigator.appVersion.indexOf("Mac")!=-1);
// win_nt=(navigator.userAgent.toLowerCase().indexOf("windows nt")


//alert("scroll: " + document.body.scrollHeight+"\noffset: " + document.body.offsetHeight);

if (ns || ns4 || ns5) var y=document.body.offsetHeight;
if (ie || ie5 || ie6) var y=document.body.scrollHeight;

parent.document.getElementById(iframe_id).style.height=y;

}


function rollOn(n)
{

		   light=eval(n+"2.src");
	       if (document [n].src == light) img=true;
		   else 
		   		{
				img=false;
           		document [n].src=light;
				}

}

function rollOff(n)
{

           if (!img)
		   	  {
			  dark=eval(n+"1.src");
              document [n].src=dark;
			  }
}