function preloadImages(images) {
	// Preload images here
	for (var i=0; i<images.length; i++) {
   		var temp = new Image;
		temp.src = images[i];
	}
}

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	// If an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	// Set the current image as background
	document.getElementById(divid).style.backgroundImage
		= "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	// Make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}

var GAdelay = 500;		// Msec for Guardian Angel fades
var GAanchor = document.getElementById('href');
var GAspan = (GAanchor ? GAanchor.firstChild : null);
var GAhref = 'https://www.tabbysplace.org/donate.html';
	
function goTo() {
	location = GAhref;
}

function GAfadeIn() {
	opacity('ga-logo', 0, 100, GAdelay);
	GAhref = '/guardian-angel-program.html';
	GAspan.replaceData(0, 200, 'Guardian Angel Program');
	GAanchor.className = 'ga-program';
	setTimeout('GAfadeOut()', GAdelay*7);
}

function GAfadeOut() {
	opacity('ga-logo', 100, 0, GAdelay);
	GAhref = '/donate.html';
	GAspan.replaceData(0, 200, 'Donate');
	GAanchor.className = 'donate';
	setTimeout('GAfadeIn()', GAdelay*7);
}

function GAheader() {
	setTimeout('GAfadeIn()', GAdelay*7);
}