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 gosearch()
// takes search critareia and produces results
{
	searchCrit	= $("search_txt").value;
	if(searchCrit == "")
	{
		alert("Please enter some search text before attempting to search");
	}
	else
	{
		$("searching").submit();
	}
}

function joinMailing()
// checks the email address and if it already exists on the list - then saves it to the list if appropriate to do so
{
	emailAdd	= $("mailing_txt").value;
	if (emailAdd.length == 0)
	// check if email address has been entered
	{
		alert("You must enter an email address in the text box before continuing.");
	}
	else
	{
		if (checkEmail(emailAdd))
		{
			// send the email address to the php page to check and save the entry
			new Ajax.Request('mailingList.php?act=save&add='+emailAdd, { asynchronous: false, method: 'get', onSuccess: function(t){ pane_content = t.responseText;} });	
			$("mailing_txt").value	= "";
			alert("You have successfully added this address (" + emailAdd + ") to the mailing list.");
		}
		else
		{
			alert("The email address you have entered is not a valid address. Required format: you@domain.ext");
		}
	}
}


function removeMailing()
{
	emailRem	= $("mailing_txt").value;
	if (emailRem.length == 0)
	// check if email address has been entered
	{
		alert("You must enter an email address in the text box before continuing.");
	}
	else
	{
		if (checkEmail(emailRem))
		{
			// send the email address to the php page to check and save the entry
			new Ajax.Request('mailingList.php?act=remove&add='+emailRem, { asynchronous: false, method: 'get', onSuccess: function(t){ pane_content = t.responseText;} });	
			$("mailing_txt").value	= "";
			alert("You have successfully remove this address (" + emailRem + ") from the mailing list.");
		}
		else
		{
			alert("The email address you have entered is not a valid address. Required format: you@domain.ext");
		}
	}
}


function checkEmail(str)
// basic check of validity on email address entered into mailing list
{
	var at		="@";
	var dot		=".";
	var lat		=str.indexOf(at);
	var lstr	=str.length;
	var ldot	=str.indexOf(dot);
	if (str.indexOf(at)==-1){
	   return false;
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		return false;
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		return false;
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false;
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
		return false;
	 }
	
	 if (str.indexOf(" ")!=-1){
		return false;
	 }

	 return true	;				
}