function addEvent(elm, evType, fn, useCapture)
{
	if(elm.addEventListener)
    {
    	elm.addEventListener(evType, fn, useCapture);
        return true;
    } else
    if (elm.attachEvent)
    {
	   var r = elm.attachEvent('on' + evType, fn);
       return r;
    }else
    {
	     elm['on' + evType] = fn;

    }
}