function openPreviousLink(elem){           
	try{
		fireEvent2(elem.parentNode.getElementsByTagName('a')[0],'click');
	}catch(error){
	//do nothing
	}
	
}

function  fireEvent2(element,event){
    if (document.createEventObject){
        // dispatch for IE
        var evt = document.createEventObject();
        return element.fireEvent('on'+event,evt)
    }
    else{
        // dispatch for firefox + others
        var evt = document.createEvent("HTMLEvents");
        evt.initEvent(event, true, true ); // event type,bubbling,cancelable
        if(typeof(element) =="object"){
            return !element.dispatchEvent(evt);
        }
        return false;
        
    }
}