// PLACEMENT
function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	} else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
		} else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}
function setFooter() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var contentHeight = document.getElementById('contentHolder').offsetHeight;
			var footerElement = document.getElementById('footer');
			var footerHeight  = footerElement.offsetHeight;
			if (windowHeight - (contentHeight + footerHeight) >= 0) {
				footerElement.style.position = 'relative';
				footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px';
			} else {
				footerElement.style.position = 'static';
			}
		}
	}
}

// MENU
startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}

// RANDOM SPINE
function randomSpine() {
		var spineArray = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14];
		//alert(spineArray);
		for(i = 0; i < 20; i++){
			var thisRan = Math.floor(Math.random() * spineArray.length);
			var thisImage = 'url(images/binding'+thisRan+'.jpg)';
			var thisID = 'book' + i;
			var thisBook = document.getElementById(thisID);
			thisBook.style.backgroundImage = thisImage;
		}
}

// CALLS
window.onload = function() {
	setFooter();
	startList();
	randomSpine();
}
window.onresize = function() {
	setFooter();
}