var isIe=(document.all)?true:false;
//设置select的可见状态
function setSelectState(state)
{
 var objl=document.getElementsByTagName('select');
 for(var i=0;i<objl.length;i++)
 {
 objl[i].style.visibility=state;
 }
}
function mousePosition(ev)
 {
 if(ev.pageX || ev.pageY)
 {
 return {x:ev.pageX, y:ev.pageY};
 }
 return {
 x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,y:ev.clientY + document.body.scrollTop - document.body.clientTop
 };
 }
//弹出方法
function showMessageBox(wTitle,content,pos,wWidth)
{
 closeWindow();
 var bWidth=parseInt(document.documentElement.scrollWidth);
 var bHeight=parseInt(document.documentElement.scrollHeight);
 if(isIe){
 setSelectState('hidden');}
 var back=document.createElement("div");
 back.id="back";
 var styleStr="top:0px;left:0px;position:absolute;background:#666;width:"+bWidth+"px;height:"+bHeight+"px;";
 styleStr+=(isIe)?"filter:alpha(opacity=40);":"opacity:0.40;";
 back.style.cssText=styleStr;
 document.body.appendChild(back);
 var mesW=document.createElement("div");
 mesW.id="mesWindow";
 mesW.className="mesWindow";
 mesW.innerHTML="<div class='mesWindowTop'><table width='100%' height='100%'><tr><td>"+wTitle+"</td><td style='width:1px;'><input type='button' onclick='closeWindow();' title='关闭窗口' class='close' value='关闭' /></td></tr></table></div><div class='mesWindowContent' id='mesWindowContent'>"+content+"</div><div class='mesWindowBottom'></div>";
 
 styleStr="left:"+(((pos.x-wWidth)>0)?(pos.x-wWidth):pos.x)+"px;top:"+(pos.y)+"px;position:absolute;width:"+wWidth+"px;";
 mesW.style.cssText=styleStr;
 document.body.appendChild(mesW);
}
 function showBackground(obj,endInt)
{
 obj.filters.alpha.opacity+=1;
 if(obj.filters.alpha.opacity<endInt)
 {
 setTimeout(function(){showBackground(obj,endInt)},8);
 }
}
//关闭窗口
function closeWindow()
{
 if(document.getElementById('back')!=null)
 {
 document.getElementById('back').parentNode.removeChild(document.getElementById('back'));
 }
 if(document.getElementById('mesWindow')!=null)
 {
 document.getElementById('mesWindow').parentNode.removeChild(document.getElementById('mesWindow'));
 }
 
 if(isIe){
 setSelectState('');}
}
//测试弹出
function testMessageBox(ev)
{
 var objPos = mousePosition(ev);
 messContent="<table width='342' border='1' align='center' cellpadding='0' cellspacing='0' bordercolor='#FFFFFF' bgcolor='#E7E7E7'><form id='form1' name='jch' method='post' action='lypd.asp' onSubmit='return chkkk();'><tr><td width='87'><div align='center'>姓名：</div></td><td><input name='name' type='text' size='22' />&nbsp;&nbsp;<font color='#FF0000'>*</font></td></tr><tr><td><div align='center'>电话：</div></td><td><input name='tel' type='text' size='22' />&nbsp;&nbsp;<font color='#FF0000'>*</font></td></tr><tr><td><div align='center'>内容：</div></td><td><label><textarea name='content' cols='30' rows='6'></textarea></label>&nbsp;<font color='#FF0000'>*</font></td></tr><tr><td><div align='center'>验证码：</div></td><td><input name='passcode' type='text' size='10' />&nbsp;&nbsp;<img src='code.asp'  align='middle' />&nbsp;<font color='#FF0000'>*</font></td></tr><tr><td colspan='2'><div align='center'><label><input type='submit' name='Submit' value='提交留言' /></label></div></td></tr></form></table>";
 showMessageBox('在线留言',messContent,objPos,350);
}
function chkkk()
{
if(document.jch.name.value.length == 0){
		alert("姓名不能为空");
		document.jch.name.focus();
		return false;
	}	
	if(document.jch.tel.value.length<7){
		alert("请正确输入电话");
		document.jch.tel.focus();
		return false;
	}	
	if(document.jch.content.value.length == 0){
		alert("请填写内容");
		document.jch.content.focus();
		return false;
	}	
	if(document.jch.passcode.value.length == 0){
		alert("请输入验证码");
		document.jch.passcode.focus();
		return false;
	}	
}