var objCount = 0;
var first = new Array();
var second = new Array();
var brname;


if (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion.substring(0,1)) >= 3))
   || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion.substring(0,1)) >= 4)))
{
	brname = navigator.appName;
}

function preload(srcfirst, srcsecond) 
{  
   first[objCount] = new Image();
   first[objCount].src = srcfirst;
   second[objCount] = new Image();
   second[objCount].src = srcsecond;
   objCount++;
}

function makeChange(imgnum,action)
{
	var result;
	switch(action)
	{
		case 1 : result = "document['obr"+imgnum+"'].src = second["+imgnum+"].src"; break; 
		case 2 : result = "document['obr"+imgnum+"'].src = first["+imgnum+"].src"; break; 
	}
	eval(result);
}

function openWin(mypage,myname,w,h,scroll)
{
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition +', scrollbars="+ scroll +", toolbar=yes'
	if(brname=="Netscape")
	{
		var mywin = "";
		if(mywin)
			mywin.close();
		mywin = window.open(mypage,'okno', settings);
		if(mywin)
			mywin.focus();
	}
	else
	{
		var mywin = "";
		if(window.mywin)
			window.mywin.close();
		window.mywin = window.open(mypage,'okno', settings);
		if(window.mywin)
			window.mywin.focus();
	}		
}