function browser_css( ) {
	 	var d,n,na,nua,win5,win6,mac,win6ie6,win6ie7,win6ff,win5ie6,win5ie7,win5ff,mac;
		d		= document;// shorthand so we don't have to write out document each time..
		n		= navigator;
		na		= n.appVersion;
		nua		= n.userAgent;
		win2	= ( nua.indexOf( 'NT 2' ) != -1 );
		win5	= ( nua.indexOf( 'NT 5' ) != -1 );
		win6	= ( nua.indexOf( 'NT 6' ) != -1 );
		mac		= ( na.indexOf( 'Mac' ) != -1 );
		//alert("appVersion = "+na);
		//alert("userAgent = "+nua);

		if (win6) {
			//alert("win6 = "+win6);
			win6ie6 = (nua.indexOf('MSIE 6') != -1);
			win6ie7 = (nua.indexOf('MSIE 7') != -1);
			win6ff3 = (nua.indexOf('Firefox/3') != -1);
			if (win6ff3) {
				win6ff = 'false' 
				} else {
				win6ff = (nua.indexOf('Firefox') != -1);
			}
		}
		if (win5) {
			//alert("win5 = "+win5);
			win5ie6 = (nua.indexOf('MSIE 6') != -1);
			win5ie7 = (nua.indexOf('MSIE 7') != -1);
			win5ff3 = (nua.indexOf('Firefox/3') != -1);
			if (win5ff3) {
				win5ff = 'false' 
				} else {
				win5ff = (nua.indexOf('Firefox') != -1);
			}
			win5net = (nua.indexOf('Net') != -1);
			if(win5ff3) {
			}
		}
		if (win2) {
			//alert("win5 = "+win5);
			win2ie = (nua.indexOf('NET CLR') != -1);
		}

		if(mac) {
			//alert("mac = "+mac);
			retval="mac";
			d.write('<link rel = "stylesheet" type = "text/css" href = "css/mac.css" />');
		} 
		
		if (win5) {
			if(win5ie7) {
				//alert("win5ie css = "+win5ie);
				retval="win5ie7";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win5ie7.css" />');
			} else if(win5ie6) {
				//alert("win5ie css = "+win5ie);
				retval="win5ie";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win5ie6.css" />');
			} else if(win5ff3) {
				//alert("win5ff3 css 2 = "+win5ff3);
				retval="win5ff3";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win5ff.css" />');
			} else if(win5ff) {
				//alert("win5ff css 2 = "+win5ff);
				retval="win5ff";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win5ff.css" />');
			}
		}
		
		if (win6) {
			if(win6ie7) {
				//alert("win6ie7 css = "+win6ie7);
				retval="win6ie7";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win6ie7.css" />');
			} else if(win6ie6) {
				//alert("win6ie6 css = "+win6ie6);
				retval="win6ie6";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win6ie6.css" />');
			} else if(win6ff3) {
				//alert("win6ff css = "+win6ff);
				retval="win6ff3";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win6ff.css" />');
			} else if(win6ff) {
				//alert("win6ff css = "+win6ff);
				retval="win6ff";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win6ff.css" />');
			} else if(win2ie) {
				//alert("win5ie css = "+win5ie);
				retval="win2ie";
				d.write('<link rel = "stylesheet" type = "text/css" href = "css/win2ie.css" />');
			} else if(win5net) {
				//alert("win5ie css = "+win5ie);
				retval="win5netscape";
				//d.write('<link rel = "stylesheet" type = "text/css" href = "css/win5net.css" />');
			}
		}
		
		//alert("retval = " + retval);
		return retval;
		
	  }