getElementsByClassName

function getElementsByClassName(parent, tagName, sName)    {        var aName = sName.split(',');        var aEls = parent.getElementsByTagName(tagName);        var bFlagFind = false;        var aResult = [];        for(var i = 0; i < aEls.length; i++)        {            bFlagFind = false;            var aClassName = aEls[i].className.split(' ');            for(var j = 0; j < aName.length; j++)            {                for(var k = 0; k < aClassName.length; k++)                {                    if(aName[j] == aClassName[k])                    {                        bFlagFind = true;                        aResult.push(aEls[i]);                        break;                    }                }                if(bFlagFind == true)                    break;            }        }        return aResult;    }