function changetab1()
	{
		document.getElementById('tab_coment1').style.display=""
		document.getElementById('tab_coment2').style.display="none"
		document.getElementById('tab_ul').style.background="url(/img/tab_a.gif) top no-repeat"
	}
	function changetab2()
	{
		document.getElementById('tab_coment1').style.display="none"
		document.getElementById('tab_coment2').style.display=""
		document.getElementById('tab_ul').style.background="url(/img/tab_q.gif) bottom no-repeat"
	}