str = navigator.appName.toUpperCase();
if(str.indexOf("NETSCAPE")>=0) brow = "moz";
else if(str.indexOf("OPERA")>=0) brow = "op";
else brow = "ie";

function getcss(name){
document.write('<link rel="stylesheet" type="text/css" href="'+name+'_'+brow+'.css" />');
}