function check_search(obj){
	var keywords= document.formsearch.keyword.value;	
	if(keywords=='请输入关键字'||keywords==''){
	alert("请输入关键字");
	return false ;	
	}else{
	document.formsearch.submit();
	return true ;	
	}
}

function cTag(showContent,selfObj){
		// 操作标签
		var ctag = document.getElementById("ctags").getElementsByTagName("li");
		var ctaglength = ctag.length;
		for(i=0; i<ctaglength; i++){
			ctag[i].className = "";
		}
		selfObj.parentNode.className = "cTag";
		// 操作内容
		for(i=0; j=document.getElementById("tagCont"+i); i++){
			j.style.display = "none";
		}
		document.getElementById(showContent).style.display = "block";
	}

var goto_top_type = -1;
var goto_top_itv = 0;

function goto_top_timer(){
var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop;
var moveby = 15;
y -= Math.ceil(y * moveby / 100);
if (y < 0) {
y = 0;
}

if (goto_top_type == 1) {
document.documentElement.scrollTop = y;
}else {
document.body.scrollTop = y;
}

if (y == 0) {
clearInterval(goto_top_itv);
goto_top_itv = 0;
}
}

function goto_top(){
if (goto_top_itv == 0) {
if (document.documentElement && document.documentElement.scrollTop) {
goto_top_type = 1;
}else if (document.body && document.body.scrollTop) {
goto_top_type = 2;
}else {
goto_top_type = 0;
}

if (goto_top_type > 0) {
goto_top_itv = setInterval('goto_top_timer()', 50);
}
}
}