function changeXXK(a){
	if(a==1){
		document.getElementById('xxk1').setAttribute('className','UserGuide_left_top_a_on');
		document.getElementById('xxk2').setAttribute('className','UserGuide_left_top_b_off');
		document.getElementById('xxk1').setAttribute('class','UserGuide_left_top_a_on');
		document.getElementById('xxk2').setAttribute('class','UserGuide_left_top_b_off');
		
		document.getElementById('showdiv1').style.display = "block";
		document.getElementById('showdiv2').style.display = "none";
	}else if(a==2){
		document.getElementById('xxk1').setAttribute('className','UserGuide_left_top_a_off');
		document.getElementById('xxk2').setAttribute('className','UserGuide_left_top_b_on');
		
		document.getElementById('xxk1').setAttribute('class','UserGuide_left_top_a_off');
		document.getElementById('xxk2').setAttribute('class','UserGuide_left_top_b_on');
		
		document.getElementById('showdiv1').style.display = "none";
		document.getElementById('showdiv2').style.display = "block";
	}
}