var browser;
var change;

browser = navigator.userAgent;
change='<style type="text/css">#content{top:190px;}#nav{top:188px;}</style>';
/*
ie mac: Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPc)
konqueror: Mozilla/5.0 (compatible; Konqueror/2.1.2; X11)
ie6: Mozilla/4.0 (compatible; MSIE 6.0; Windows..)
*/
if(browser.indexOf("Mac") > -1) {
  if(browser.indexOf("MSIE") > -1) {
    document.write(change);
  }
}
if(browser.indexOf("Konqueror") > -1) {
  document.write(change);
}