browser_name = navigator.appName; 
browser_version = parseFloat(navigator.appVersion); 

if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; } 
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; } 
else { roll = 'false'; } 

	but1_a = new Image ();
	but1_a.src = "/eng/images/but1_a.gif";
	but1 = new Image ();
	but1.src = "/eng/images/but1.gif";

	but2_a = new Image ();
	but2_a.src = "/eng/images/but2_a.gif";
	but2 = new Image ();
	but2.src = "/eng/images/but2.gif";

	but3_a = new Image ();
	but3_a.src = "/eng/images/but3_a.gif";
	but3 = new Image ();
	but3.src = "/eng/images/but3.gif";

	but4_a = new Image ();
	but4_a.src = "/eng/images/but4_a.gif";
	but4 = new Image ();
	but4.src = "/eng/images/but4.gif";

	but5_a = new Image ();
	but5_a.src = "/eng/images/but5_a.gif";
	but5 = new Image ();
	but5.src = "/eng/images/but5.gif";

	but6_a = new Image ();
	but6_a.src = "/eng/images/but6_a.gif";
	but6 = new Image ();
	but6.src = "/eng/images/but6.gif";

	but7_a = new Image ();
	but7_a.src = "/eng/images/but7_a.gif";
	but7 = new Image ();
	but7.src = "/eng/images/but7.gif";
	
function over(im) { if (roll == 'true') { document[im].src = eval(im + "_a.src"); } } 
function out(im)  { if (roll == 'true') { document[im].src = eval(im + ".src"); } }