var textIsVisible = false;
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
//this function swaps the images
function changeImages() {
	if (document.images && (preloadFlag == true)) {	
		for (var i=0; i<changeImages.arguments.length; i+=1) {
		document[changeImages.arguments[i]].src = 'images/' + changeImages.arguments[i] + '_' + changeImages.arguments[i+1] + '.jpg';
	//		alert('images/' + changeImages.arguments[i] + '_'  + changeImages.arguments[i+1] + '.jpg');	
			if(changeImages.arguments[i]=='tripod_family_portrait'){
				if(textIsVisible){
				document.getElementById('text').setAttribute('class','hidden-text');
				textIsVisible=false;
				}
				else{
				document.getElementById('text').setAttribute('class','shown-text');
				textIsVisible = true;
				}
			}
		}
	}
}
var preloadFlag = false;
function preloadImages(page) {
	if (document.images) {
		x = newImage("images/b_logo_over.jpg");
		x = newImage("images/b_construction_over.jpg");
		x = newImage("images/b_past_over.jpg");
		if (page=='pirate'){
		}
		else if(page=='tripod'){
			x = newImage("../images/b_pirate_over.jpg");
			x = newImage("../images/tripod_family_portrait_over");
		}
		preloadFlag = true;
	}

}