function browser_name() {
		var browser_name = navigator.appName;
		return browser_name;
	}

	function browser_version() {
		var browser_version = parseFloat(navigator.appVersion);
		return browser_version;
	}

	function browser_os() {
		if(navigator.appVersion.indexOf("Win95") > 0) return "WIN95";
		else if(navigator.appVersion.indexOf("Win16") > 0) return "WIN31";
		else if(navigator.appVersion.indexOf("WinNT") > 0) return "NT";
		else if(navigator.appVersion.indexOf("Mac") > 0) return "MAC";
		else if(navigator.appVersion.indexOf("UNIX") > 0) return "UNIX";
		else return "UNKNOWN";
	}

var browserOk = false;

if (browser_name() == "Netscape" && browser_version() >= 3.0) browserOk = true;
else if (browser_name() == "Microsoft Internet Explorer" && browser_version() >= 3.0) browserOk = true;

function chg_button(titlename, onoff, qty) 
{

 if (browserOk == true) {
 		if (qty == 1) {
 			document[titlename + "_1"].src = "images/button_" + titlename + "_" + onoff + "_1.gif";
 		}
 		if (qty == 2) {
 			document[titlename + "_1"].src = "images/button_" + titlename + "_" + onoff + "_1.gif";
 			document[titlename + "_2"].src = "images/button_" + titlename + "_" + onoff + "_2.gif";
 		}
	}
}

function chg_home(onoff) 
{

	if (browserOk == true) {
		document.home.src = "images/button_home_" + onoff + ".jpg";
	}
}

function chg_portfolio(which) 
{

 if (browserOk == true) {
		document.portfolio_big.src = "images/homepage/" + which + ".jpg";
		document.tracker.entry.value = which;
	}
}


function open_entry() 
{
	location.href = "portfolio_detail_" + document.tracker.entry.value + ".asp";
}


function open_window (page) {

date = new Date();
counter = Math.floor((date.getSeconds()/60)*100);

	new_window = window.open (page,"a" + counter + "a","width=780,height=450,toolbar=no,location=no,scrollbars=yes,directories=no,menubar=no,resizable=yes");
}