function getobjbyid(id){
	if(typeof(id)!="string"||id=="") return null;
	if(document.all) return document.all(id);
	if(document.getElementById) return document.getElementById(id);
	try{
		return eval(id);
	}catch(e){
		return null;
	}
}

function getLeftChars(varField,limit_len){
	var i=0;
	var counter=0;
	var cap=limit_len*2;
	var j=0;
	var runtime=(varField.value.length>cap)? (cap+1) : varField.value.length;
	for(i=0;i<runtime;i++){
		if(varField.value.charCodeAt(i)>127||varField.value.charCodeAt(i)==94){
			j=j+2;
		}else{
			j=j+1;
		}
	}
	//var leftchars=cap-varField.value.length;
	var leftchars=cap-j;
	return(leftchars);
}

function limitWords(varField,a_str,a_limit){
	var leftChars=getLeftChars(varField,a_limit);
	if(leftChars>=0){
		return true;
	}else{
		ls_str=a_str+"的内容请限定在"+a_limit+"个汉字以内";
		window.alert(ls_str);
		varField.focus();
		return false;
	}
	return true;
}

function ask(){
	top.location.href="ask.php?backurl=ask.php&kw="+document.se.kw.value;
}

function search(){
	top.location.href="search.php?kw="+document.se.kw.value;
}

function timerun(){//循环显示在线时间
	s=parseInt(s)+1;
	h=Math.floor(s/(60*60));
	i=Math.floor(s/(60));

	c=s-i*60;
	i=i-h*60;

	t="在线时间："+h+"小时"+i+"分钟";
	document.log.clock.value=t;

	setTimeout("timerun()",1000);
}