function clearSearch() {
  var f = document.forms["search"];
  if(f.q.value == "产品名称") {
		f.q.value = "";
    }
}

function replaceSearch() {
	var f = document.forms["search"];
	if (f.q.value == "") {
		f.q.value = "产品名称";
	}
}

function clearRUG() {
	var x = document.forms["rugsignup_form"];
	if (x.email.value == "您的邮箱地址") {
		x.email.value = "";
		/*您的邮箱地址*/
	}
}

function replaceRUG() {
	var x = document.forms["rugsignup_form"];
	if (x.email.value == "") {
		x.email.value = "您的邮箱地址";
	}
}