function popup_image(image_url, title) {
    var winl = (screen.width - 800)/2;
    var wint = (screen.height - 600)/2;
    var settings ='top='+wint+',';
    settings +='left='+winl+',';
    settings +='width=200, ';
    settings +='height=300, ';
    settings +='scrollbars=no,';
    settings +='resizable=yes';

    title = title.replace(/\s/g, '%20');

    win=window.open('/image_popup.php?image_url='+image_url+'&title='+title, 'image',settings);

    if(parseInt(navigator.appVersion) >= 4) {
       win.window.focus();
    }
}

if (document.images)
{
/* preload images */
var spacerOn = new Image();
spacerOn.src = "images/spacer.gif";
}

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) {
		home_over = newImage("images/home-over.gif");
		at_the_hub_faclitities_over = newImage("images/at-the-hub-faclitities-over.gif");
		manawatu_over = newImage("images/manawatu-over.gif");
		education_over = newImage("images/education-over.gif");
		activities_over = newImage("images/activities-over.gif");
		enquiry_over = newImage("images/enquiry-over.gif");
		links_over = newImage("images/links-over.gif");
		languages_over = newImage("images/languages-over.gif");
		immigration_over = newImage("images/immigration-over.gif");
		preloadFlag = true;
	}
}