//For preloading page relevant images
var loaded = false;

function preload(){
	if(document.images){
		button = new Array();
		button[0] = new Image();
		button[0].src = "images/FutureButton.png";
		button[1] = new Image();
		button[1].src = "images/FutureButtonOver.png";
		button[2] = new Image();
		button[2].src = "images/HomeButton.png";
		button[3] = new Image();
		button[3].src = "images/HomeButtonOver.png";
		button[4] = new Image();
		button[4].src = "images/PastButton.png";
		button[5] = new Image();
		button[5].src = "images/PastButtonOver.png";
		button[6] = new Image();
		button[6].src = "images/ContactButton.png";
		button[7] = new Image();
		button[7].src = "images/ContactButtonOver.png";
		button[8] = new Image();
		button[8].src = "images/HistoryButton.png";
		button[9] = new Image();
		button[9].src = "images/HistoryButtonOver.png";
		loaded = true;
	}
}

//For swapping the buttons
function changeImg(img, num){			//num is the number of the image as it occurs on the page
	if(loaded == true){					//num is also the images index number
		document.images[img].src = button[num].src;
	}
}

function preloadPrev(num){
	if(document.images){
		switch(num){
			case 1:
			prevImg = new Array();
			prevImg[0] = new Image();
			prevImg[0].src = "images/Backpack017_17small.JPG";
			prevImg[1] = new Image();
			prevImg[1].src = "images/Backpack019_19small.JPG";
			prevImg[2] = new Image();
			prevImg[2].src = "images/Backpack020_20small.JPG";
			prevImg[3] = new Image();
			prevImg[3].src = "images/Backpack021_21small.JPG";
			prevImg[4] = new Image();
			prevImg[4].src = "images/Backpack040_16small.JPG";
			prevImg[5] = new Image();
			prevImg[5].src = "images/Backpack041_17small.JPG";
			prevImg[6] = new Image();
			prevImg[6].src = "images/Holiday002_2small.JPG";
			prevImg[7] = new Image();
			prevImg[7].src = "images/Holiday019_20small.JPG";
			prevImg[8] = new Image();
			prevImg[8].src = "images/Holiday021_22small.JPG";
			prevImg[9] = new Image();
			prevImg[9].src = "images/Holiday024_25small.JPG";
			prevImg[10] = new Image();
			prevImg[10].src = "images/Holiday108_8small.JPG";
			prevImg[11] = new Image();
			prevImg[11].src = "images/Holiday113_12small.JPG";
			prevImg[12] = new Image();
			prevImg[12].src = "images/Holiday114_14small.JPG";
			prevImg[13] = new Image();
			prevImg[13].src = "images/Holiday123_23small.JPG";
			prevImg[14] = new Image();
			prevImg[14].src = "images/Holiday127_27small.JPG";
			loaded = true;
			break;
			case 2:
			prevImg = new Array();
			prevImg[15] = new Image();
			prevImg[15].src = "images/SH_Book004_4small.JPG";
			prevImg[16] = new Image();
			prevImg[16].src = "images/SH_Book005_5small.JPG";
			prevImg[17] = new Image();
			prevImg[17].src = "images/SH_Book006_6small.JPG";
			prevImg[18] = new Image();
			prevImg[18].src = "images/SH_Book009_9small.JPG";
			prevImg[19] = new Image();
			prevImg[19].src = "images/SH_Book011_11small.JPG";
			prevImg[20] = new Image();
			prevImg[20].src = "images/SH_Book024_24small.JPG";
			prevImg[21] = new Image();
			prevImg[21].src = "images/SH_Table009_9small.JPG";
			prevImg[22] = new Image();
			prevImg[22].src = "images/SH_Table021_21small.JPG";
			prevImg[23] = new Image();
			prevImg[23].src = "images/SH_Table015_15small.JPG";
			prevImg[24] = new Image();
			prevImg[24].src = "images/SH_Table016_16small.JPG";
			prevImg[25] = new Image();
			prevImg[25].src = "images/SH_Table018_18small.JPG";
			prevImg[26] = new Image();
			prevImg[26].src = "images/SH_Table020_20small.JPG";
			prevImg[27] = new Image();
			prevImg[27].src = "images/holiday2004_group.jpg";
			prevImg[28] = new Image();
			prevImg[28].src = "images/holiday2004_child1_fit.jpg";
			prevImg[29] = new Image();
			prevImg[29].src = "images/holiday2004_child2_fit.jpg";
			prevImg[30] = new Image();
			prevImg[30].src = "images/holiday2004_child3.jpg";
			loaded = true;
			break;
		}
	}
}

//For swapping preview images
function changePrevImg(img, num){		//num is the number of the image as it occurs on the page
	if(loaded == true){					//num is also the images index number
		document.images[img].src = prevImg[num].src;
	}
}