function changePage(page){
	var main = document.getElementById("main");
	main.src = page;
	var positionName = document.getElementById("positionName");
	var enterpriseBaseInfoImg = document.getElementById("enterpriseBaseInfoImg");
	var communicationImg = document.getElementById("communicationImg");
	if(page == "listEnterprise") {
		positionName.innerHTML = "企业基本信息";
		enterpriseBaseInfoImg.src="images/enterprise_base_info_rollover.gif";
		communicationImg.src = "images/communication_original.gif";
	} else if (page == "allInformation") {
		positionName.innerHTML = "企业交流";
		communicationImg.src = "images/communication_rollover.gif";
		enterpriseBaseInfoImg.src="images/enterprise_base_info_original.gif";
	}
}