/***************************************************************************************/
/* Form validation functions */
/***************************************************************************************/
function validateEmailAddress(obj, formObj, formValue) {
	var regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
	return regex.test(formValue);
}

function validateOptionalEmail(obj, formObj, formValue) {
	if(formValue != '') {
		var regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
		return regex.test(formValue);
	} else {
		return true
	}
}

/***************************************************************************************/
/* Change the display of an element */
/***************************************************************************************/
function changeElementDisplay(el)
{
	displayItem = document.getElementById(el).style
	if (displayItem.display == 'none')
		displayItem.display = '';
	else
		displayItem.display = 'none';
}

function changeRegistrationDisplay(el1,el2)
{
	if (document.getElementById(el1).checked)
		document.getElementById(el2).style.display = '';
	else
		document.getElementById(el2).style.display = 'none';
}
function UpdatePriceNb(int_number)
{
	
}

/***************************************************************************************/
/* Open window function */
/***************************************************************************************/
function openStatsWindow(url)
{
		var newWindow = window.open(url, "", "HEIGHT=338,WIDTH=600,toolbar=no,scrollbar=yes,status=no,menubar=no,resizeable=no");
}

/***************************************************************************************/
/* Macromedia Dreamweaver Rollover code */
/***************************************************************************************/
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) { //v4.0
  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 && document.getElementById) x=document.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];}
}

/***************************************************************************************/
/* Rollover code */
/***************************************************************************************/

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		events_on		= newImage("/siteimages/Navigation/forthcoming_events_on.gif");
		aboutus_on		= newImage("/siteimages/Navigation/about_us_on.gif");
		speaking_on		= newImage("/siteimages/Navigation/speaking_opportunities_on.gif");
		register_on		= newImage("/siteimages/Navigation/conference_registration_on.gif");
		papers_on		= newImage("/siteimages/Navigation/conference_papers_on.gif");
		contact_on 		= newImage("/siteimages/Navigation/contact_us_on.gif");
		links_on	 	= newImage("/siteimages/Navigation/related_sites_on.gif");
		mailing_list_on	= newImage("/siteimages/Navigation/mailing_list_on.gif");
		past_events_on	= newImage("/siteimages/Navigation/past_programmes_on.gif");
		past_photos_on	= newImage("/siteimages/Navigation/past_photographs_on.gif");
		preloadFlag = true;
	}
}