// JavaScript Document
document.onselectstart=function(){return false;}//网页禁止鼠标键盘事件
document.oncontextmenu=function(){return false;}
document.onkeydown=function(){
      if(event.ctrlKey)return false;
}

function CheckForm()								//检测留言内容不为空
{
	if (document.getElementById("txtname").value=="")
	{
		alert("请输入您的姓名！");
		document.getElementById("txtname").focus();
		return false;
	}
	if (document.getElementById("txtemail").value==""){
       alert ("请输入您的邮箱！");
       document.getElementById("txtemail").focus();
       return(false);
    }
	if (document.getElementById("txttitle").value==""){
       alert ("请输入您的主题！");
       document.getElementById("txttitle").focus();
       return(false);
    }
	if (document.getElementById("txttel").value==""){
       alert ("请输入您的电话或手机号码！");
       document.getElementById("txttel").focus();
       return(false);
    }
	if (document.getElementById("txtcontent").value==""){
       alert ("请输入您的留言内容！");
       document.getElementById("txtcontent").focus();
       return(false);
    }
	alert ("留言成功！");
}

var minmax_elements; 
minmax_props= new Array(new Array('min-width', 'minWidth'),new Array('max-width', 'maxWidth'),new Array('min-height','minHeight'),new Array('max-height','maxHeight')); 
function minmax_bind(el){
var i, em, ms;
var st= el.style, cs= el.currentStyle;
if (minmax_elements==window.undefined) {
   if (!document.body || !document.body.currentStyle) 
    return;
   minmax_elements= new Array();
   window.attachEvent('onresize', minmax_delayout);
   em= document.createElement('div');
   em.setAttribute('id', 'minmax_em');
   em.style.position= 'absolute';
   em.style.visibility= 'hidden';
   em.style.fontSize= 'xx-large';
   em.style.height= '5em';
   em.style.top='-5em';
   em.style.left= '0';
}
for (i= minmax_props.length; i-->0;)
   if (cs[minmax_props[i][0]])
    st[minmax_props[i][1]]= cs[minmax_props[i][0]];
for (i= minmax_props.length; i-->0;) {
   ms= cs[minmax_props[i][1]];
   if (ms && ms!='auto' && ms!='none' && ms!='0' && ms!=''){
    st.minmaxWidth= cs.width; st.minmaxHeight= cs.height;
    minmax_elements[minmax_elements.length]= el;
    minmax_delayout();
    break;
   }
}
}

var minmax_fontsize= 0; function minmax_checkFont() {
var fs= document.getElementById('minmax_em').offsetHeight;
if (minmax_fontsize!=fs && minmax_fontsize!=0)
   minmax_delayout();
minmax_fontsize= fs;
return '5em';
}

var minmax_delaying= false;
function minmax_delayout(){
if (minmax_delaying)
   return;
minmax_delaying= true;
window.setTimeout(minmax_layout, 0);
}

function minmax_stopdelaying() {
minmax_delaying= false;
}
function minmax_layout() {
window.setTimeout(minmax_stopdelaying, 100);
var i, el, st, cs, optimal, inrange;
for (i= minmax_elements.length; i-->0;) {
   el= minmax_elements[i]; st= el.style; cs= el.currentStyle;
   st.width= st.minmaxWidth; optimal= el.offsetWidth;
   inrange= true;
   if (inrange && cs.minWidth && cs.minWidth!='0' && cs.minWidth!='auto' && cs.minWidth!='') {
    st.width= cs.minWidth;        
    inrange= (el.offsetWidth<optimal);      
   }      
   if (inrange && cs.maxWidth && cs.maxWidth!='none' && cs.maxWidth!='auto' && cs.maxWidth!='') {
    st.width= cs.maxWidth;        
    inrange= (el.offsetWidth>optimal);      
   }      
   if (inrange)
    st.width= st.minmaxWidth;
   st.height= st.minmaxHeight; 
   optimal= el.offsetHeight;      
   inrange= true;      
   if (inrange && cs.minHeight && cs.minHeight!='0' && cs.minHeight!='auto' && cs.minHeight!='') {
    st.height= cs.minHeight;        
    inrange= (el.offsetHeight<optimal);     
   }      
   if (inrange && cs.maxHeight && cs.maxHeight!='none' && cs.maxHeight!='auto' && cs.maxHeight!='') {
    st.height= cs.maxHeight;
    inrange= (el.offsetHeight>optimal);
   }
   if (inrange) st.height= st.minmaxHeight;
}
} 

var minmax_SCANDELAY= 500;
function minmax_scan() {
var el;
for (var i= 0; i<document.all.length; i++) {
   el= document.all[i];
   if (!el.minmax_bound) {
    el.minmax_bound= true;
    minmax_bind(el);
   }
}
}

var minmax_scanner;
function minmax_stop() {
window.clearInterval(minmax_scanner);
minmax_scan();
}

minmax_scan();
minmax_scanner= window.setInterval(minmax_scan, minmax_SCANDELAY);
window.attachEvent('onload', minmax_stop);