function Check()
{
	var   notnull=true;   
		  if  (form1.txtName.value=="")   
		  {   
		  		form1.txtName.focus();   
		  		alert("发信人不能为空!");   
		  		notnull=false;   
		  } 
  		  else if (form1.txtTitle.value=="")   
		  {   
		  		form1.txtTitle.focus();   
		  		alert("信件标语不能为空!");   
		  		notnull=false;   
		  } 
		  else if (form1.txtContent.value=="")   
		  {   
		  		form1.txtContent.focus();   
		  		alert("信件内容不能为空!");   
		  		notnull=false;   
		  } 
	return notnull;
}

function Clear()
{
    form1.txtName.value="";
    form1.txtEmail.value="";
    form1.txtPhone.value="";
    form1.txtTitle.value="";
    form1.txtContent.value="";
    form1.txtName.focus();
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function ImgChangue(n)
{
    switch(n)
    {
        case 2:
            document.getElementById("ig1").src="images/index_80_1.jpg";
            document.getElementById("ig2").src="images/index_81.jpg";
            break;
        default:
            document.getElementById("ig1").src="images/index_80.jpg";
            document.getElementById("ig2").src="images/index_81_1.jpg";
            break;
    }    
}

function show_page(ctr_name,num,title_ctr){
  var div_ctr=document.all.item(ctr_name);
  if (div_ctr!=null){
    for (var n=0;n<div_ctr.length;n++){
		if(n==num-1){
			div_ctr[n].style.display="";
		}
		else{
			div_ctr[n].style.display="none";
		}
	}
  }
  else{
	  alert('参数有误');
  }
}