function imgswap(imgname,imgsrc) {
	withroot = 'images/' + imgsrc + '.gif';
	document.images[imgname].src = withroot;
	}

var preloadImgs = new Array();
var preloads = new Array();
preloads = ['british_council_over', 'oxford_vision_2020_over', 'channel4_over', 'enterprise_insight_over', 'london_fashion_week_over','japan_over', 'vietnam_over', 'indonesia_over', 'pakistan_over'];
for(i=0;i<preloads.length;i++) {
	preloadImgs[i] = new Image();
	preloadImgs[i].src = "images/" + preloads[i] + ".gif";
	}

if (!document.formname.gender[0].checked &&
!document.formname.gender[1].checked {
	// no radio button is selected
	return false;
}



function validate(theform)
{
	if ( theform.gender.value==unchecked )
	{
		alert("Please tell us if you are male or female");
		return false;
	}
	
	if ( theform.age.value.indexOf("@") <1 )
	{
		alert("Please tell us your age");
		return false;
			}
	if ( theform.visited.value=="" )
	{
		alert("Please tell us if you have ever visited, or even heard about, Mary King's Close in Edinburgh");
		return false;
	}
	if ( theform.believe.value=="" )
	{
		alert("Please tell us if you believe in the existence of ghosts");
		return false;
	}
	if ( theform.taken.value=="" )
	{
		alert("Please tell us if this first time that you have taken part in this experiment");
		return false;
	}

	return true;
}