function changecss(theClass,element,value) {
          var cssRules;
         if (document.all) {
          cssRules = 'rules';
         }
         else if (document.getElementById) {
          cssRules = 'cssRules';
         }
         for (var S = 0; S < document.styleSheets.length; S++){
          for (var R = 0; R < document.styleSheets[S][cssRules].length; R++) {
           if (document.styleSheets[S][cssRules][R].selectorText == theClass) {
            document.styleSheets[S][cssRules][R].style[element] = value;
           }
        }
    }
}