var NS4CSS = "mtc_ns4.css";
var NS6CSS = "mtc_ns6.css";
var IE4CSS = "mtc_ie.css";

function ChooseStyleSheet() {
	var styles = NS6CSS ;
	switch(navigator.family)
	{
	case 'gecko':
	 	styles = NS6CSS ;
		break;
	  
	case 'ie4':
		styles = IE4CSS ;
		break;
	  
	case 'nn4':
	 	styles = NS4CSS ;
		break;
	}
	document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"/images/" + styles + "\">");
	return true;
}

ChooseStyleSheet()