var image_index = 1;
var image_index_max = 4;

function switch_image(id){
	if(document.getElementById("ctrtaxlt_imageInfo_"+id) == null) return;
	
	for(var i = 1;i <= 4;i++){
		if(document.getElementById("ctrtaxlt_imageInfo_"+i) == null) break;
		document.getElementById("ctrtaxlt_imageInfo_"+i).style.display="none";
		document.getElementById("swtich_button_"+i).className="switch_button";
	}
	
	document.getElementById("ctrtaxlt_imageInfo_"+id).style.display="";
	document.getElementById("swtich_button_"+id).className="switch_button_active";
}
/*自动切换图片新闻*/
function auto_switch(){
	switch_image(image_index);
	image_index++;
	if(image_index > image_index_max) 
		image_index = 1;
}

setInterval("auto_switch()",3000);