// JavaScript Document

/**************************************
The functions are used to exchange pictures of the top menu.
**************************************/

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_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_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];}
}

/**************************************
The function is used to check the user inputs
**************************************/

function checkForm(){
	if($('title').value == ""){
		$('title').focus();
		alert("Title field can't be empty");
		return false;
	}
	if($('url').value == ""){
		$('url').focus();
		alert("Url field can't be empty");
		return false;
	}
	if($('description').value == ""){
		$('description').focus();
		alert("Description area can't be empty");
		return false;
	}
	if($('name').value == ""){
		$('name').focus();
		alert("Name field can't be empty");
		return false;
	}
	if($('email').value == ""){
		$('email').focus();
		alert("Email field can't be empty");
		return false;
	}
	if($('categorysub1').value == ""){
		$('categorysub1').focus();
		alert("Please input a deep category");
		return false;
	}
	if($('categorysub2').value == ""){
		$('categorysub2').focus();
		alert("Please input another deep category as backup");
		return false;
	}
	if($('categorytop1').value == 0){
		$('categorytop1').focus();
		alert("Please select a main category");
		return false;
	}
	if($('categorytop2').value == 0){
		$('categorytop2').focus();
		alert("Please select another main category as backup");
		return false;
	}
	if($('imagecode').value == ""){
		$('imagecode').focus();
		alert("Please input the code shown");
		return false;
	}
	if($('agree').checked == false){
		$('agree').focus();
		alert("Please tick the checkbox and accept the terms of use of all the directories");
		return false;
	}
	if(($('reciprocal').value == 'http://www.gtsee.com/backlinks.html' || $('reciprocal').value == 'www.gtsee.com/backlinks.html' || $('reciprocal').value == 'gtsee.com/backlinks.html') && $('cb1').checked == false){
		$('cb1').focus();
		alert("Are you sure to use gtsee.com/backlinks.html as the reciprocal file? An extra $1 will be charged for this. Or please download the backlinks.rar, unzip and upload the file to your server, input the url for backlinks.html in reciprocal link field!");
		return false;
	}
	
	return true;
		
}

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