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 show_submit(){
	if(check_input(document.getElementById('form2'),'p')){
		document.getElementById('submit_d').style.display='block';
		return true;
	}
	return false;
}
function display(evn){
	document.getElementById('how').style.display='block';
	document.getElementById('how').style.left=710+'px';
	document.getElementById('how').style.top=630+'px';
}
function check_input(f){
	var regexp=new RegExp("^[(\\w)-_\.]{1,}@+(\\w){1,}\.+(\\w){2,}");
	if(f.url.value.length<10){
		alert('Please input the url of your website!');
		f.url.focus();
		return false;
	}
	if(f.title.value.length<5){
		alert('Please input a valid title no shorter than 5 letters!')
		f.title.focus();
		return false;
	}
	if(f.description.value.length<20){
		window.alert("Please input a short description of your website. No shorter than 20 characters!");
		f.description.focus();
		return false;
	} else if(f.description.value.length>200){
		window.alert("Please keep the description shorter than 200 characters.");
		f.description.focus();
		return false;
	}
	if((f.email.value.length<1)||(!regexp.test(f.email.value))){
		window.alert("Please input a valid email address!")
		f.email.focus();
		return false;
	}
	if(f.linktous.value.length<10){
		alert("Please add a reciprocal link to us and input the url!");
		f.linktous.focus();
		return false;
	}
	return true;
	
}