var ie60 = (navigator.userAgent.indexOf('MSIE 6.0') != -1);
var ie70 = (navigator.userAgent.indexOf('MSIE 7.0') != -1);
var ffox = (navigator.userAgent.indexOf('Firefox') != -1);
//var sheetffox = ffox;
link1    = '<LINK REL="stylesheet" HREF="';
link2    = '" TYPE="text\/css">';
styles0  = 'assets/css/stijlen-ie.css';
styles01  = 'assets/css/stijlen-ie6.css';
styles1  = 'assets/css/stijlen-ff.css';
styles2  = 'assets/css/stijlen.css';
if (ie70) {
document.write(link1 + styles0 + link2);
} else if (ie60) {
document.write(link1 + styles01 + link2);	
} else if (ffox) {
document.write(link1 + styles1 + link2);	
}
else {
document.write(link1 + styles2 + link2);
}