// JavaScript Document

// change css class  
function changeClassProperty(sClassName,sProperty,sValue) {
  sClassName="."+sClassName;
  var sheets = document.styleSheets;
  var rules;
  var styleObj;
  for (i=0;i< sheets.length; i++) {
    rules=sheets[i].cssRules || sheets[i].rules;
    for (var j=0; j<rules.length; j++) {
      if (rules[j].selectorText && rules[j].selectorText==sClassName) {
        styleObj=rules[j].style;
        styleObj[sProperty]=sValue;
        break;
      }
    }
  }
}