//全选函数
function yes_che(f){
	for (var i = 0; i < f.elements.length; i ++){
		if (f.elements[i].type == "checkbox"){
			f.elements[i].checked = true;
		}
	}
}

//全不选函数
function no_che(f){
	for (var i = 0; i < f.elements.length; i++){
		if (f.elements[i].type == "checkbox"){
			f.elements[i].checked = false;
		}
	}
}

//反选函数
function contrary_che(f){
	for (var i = 0; i < f.elements.length; i++){
		if (f.elements[i].type == "checkbox"){
			f.elements[i].checked = !f.elements[i].checked;
		}
	}
}

//检查多选框是否选中
function checked(f){
	var num = 0;
	for (var i = 0; i < f.elements.length; i++){
		if (f.elements[i].type == "checkbox"){
			if (f.elements[i].checked == true){
				num++;
			}
		}
	}
	if (num == 0){
		alert("抱歉，至少选择一位用户进行删除！");
		return false;
	}
}

//更改价钱信息
function price(id){
	var ge = document.getElementById(id);
	var e = event.srcElement;
	if (e.options[e.selectedIndex].value == "求租" || e.options[e.selectedIndex].value == "出租"){
		ge.innerText = "元/月";
	}else if (e.options[e.selectedIndex].value == "出售" || e.options[e.selectedIndex].value == "求购"){
		ge.innerText = "万元";
	}
}


//检查表单是否为数字
function num(n){
	if (/\D+/gi.test(n) || n.length == 0){
		return false;
	}else
		return true;
}

//弹出窗口
function win_open(url,tit,s){
	window.open(url,tit,s);
}

//过滤数字前位的零
function reduce(v){
	document.all(v).value = document.all(v).value.replace(/^(\0+)(\S*)$/gi,$2)
}

//更改表单背景颜色
function bnt_bg(t,co){
	t.style.background = co;
}


//检查值的长度
function get_len(str){
	if (str.length > 5){
		return false;
	}else
		return true;
}

//判断价格和面积开头是否有0
function is_zero(str){
	$(str).value = $(str).value.replace(/^[0]*/gi,"");
}

//去掉空格
function r_s(str){
	$(str).value = $(str).value.replace(/(^\s*)|(\s*$)/gi,"");
}

//获得ID
function $(id){
	return document.getElementById(id);
}


//检查用户名是否合格
function r_name(str){
	if (/[^\w\u0391-\uFFE5]/gi.test(str)){
		return false;
	}else
		return true;
}


function change_font_color(){
	if ($("regs").style.color == "yellow"){
		$("regs").style.color = "blue";
	}else{
		$("regs").style.color = "yellow";
	}
	setTimeout("change_font_color()","300");
}



//转到页
function gopage(o,url){
	var obj = $(o);
		if (obj.value.length == 0){
			alert("抱歉，请输入页数！");
			obj.select();
		}else if (!(/^\d*$/gi.test(obj.value))){
			alert("抱歉，页数只能为数字！");
			obj.value = "";
			obj.select();	
		}else{
			location.href = url + "page=" + obj.value;
		}
}