function SaFanSei(a,b,c)
{
	document.getElementById(a).style.display='';
	document.getElementById(b).style.display='none';
	document.getElementById(c).style.display='none';
}
function bian(tabno){
	
	if(tabno == "tab1"){
		document.getElementById("tab1").className = "tab left tab1 tab1_bg2 gray";
		document.getElementById("tab2").className = "tab left tab2 tab2_bg1 white";
		document.getElementById("tab3").className = "tab left tab3 tab3_bg1 white";
		
	}else if(tabno == "tab2"){
		document.getElementById("tab1").className = "tab left tab1 tab1_bg1 white";
		document.getElementById("tab2").className = "tab left tab2 tab2_bg2 gray";
		document.getElementById("tab3").className = "tab left tab3 tab3_bg3 white";
	}else{
				document.getElementById("tab1").className = "tab left tab1 tab1_bg1 white";
		document.getElementById("tab2").className = "tab left tab2 tab2_bg3 white";
		document.getElementById("tab3").className = "tab left tab3 tab3_bg2 gray";
	}
	

}