function openPopUpWindow(url,title,width,height) {
  
  ScreenWidth = screen.width; 
  ScreenHeight = screen.height; 

  xpos = (ScreenWidth/2)-(width/2); 
  ypos = (ScreenHeight/2)-(height/2); 
  option = "left="+xpos+",top="+ypos+",width="+width+",height="+height+",status=0,statusbar=0,toolbar=0";
  neupop = window.open(url,title,option);

}

//CSS Funktionen
function findCSSRule(ruleName) {
    ruleName = ruleName.toLowerCase();
    var stylesheet = document.styleSheets[0];

    var rules = null;
    rules = (typeof stylesheet.rules != 'undefined') ?
                                   stylesheet.rules : // IE
                                   stylesheet.cssRules; // FF 

    var ret = null;
    for (var i = 0; i < rules.length; i++){
      if (rules[i].selectorText.toString().toLowerCase() == ruleName) {        
        ret = rules[i];
        break;
      }
    }
    rules = null;
    return ret;
}