var popwin;
function openWin(isurl, winw, winh, spec) {
	var x = screen.availWidth;
	var y = screen.availHeight;
	var width = winw;
	var height = winh;
	var left = (x - width) / 2;
	var top = (y - height) / 2;
	popwin = window.open(isurl,"popupwin",spec+",top="+top+",left="+left+",width="+width+",height="+height);
	popwin.focus();
	popwin = null;
	return false;
}

var currentPosition = 0;
function showImage(xPosition) {
	if(currentPosition != xPosition) {
		new Effect.Move('slide', {x:xPosition, mode: 'absolute'});
		currentPosition = xPosition;
		//$('slide').blur();
	}
	return false;
}

function toggleInput(obj, defaultVal) {
	if(obj.value == defaultVal) {
		obj.value = "";
	} else if(obj.value == "") {
		obj.value = defaultVal;
	}
}

function validateLocation(form) {
	if($('saddr').value == "") {
		alert('Please enter a location or postcode');
		return false;
	}
	form.target = "_blank";
}