createNewImage('home-button,about-button,what-we-do-button,how-we-do-it-button,case-studies-button,news-button,contact-us-button,help-centre-button');

function createNewImage(input) {
	var image = new Array();
	totalImages = input.split(",");
	for (x=0;x<totalImages.length;x++) {
		image[x] = new Image();
		image[x].src = '../images/menu/' + totalImages[x] + '.gif';
		image[x].src = '../images/menu/' + totalImages[x] + '-selected.gif';
	}
}

function changeHover(image, state) {
	if (state == 'over') {
		imageSrc = image.src;
		imageSrcNoExt = imageSrc.substr(0, imageSrc.length - 4);
		imageSrcExt = imageSrc.substr(imageSrc.length - 4, 4);
		re = new RegExp('-selected', 'gi');
		imageSrcNoExt = imageSrcNoExt.replace(re, '');
		image.src = imageSrcNoExt + '-selected' + imageSrcExt;
	} else {//out
		imageSrc = image.src;
		re = new RegExp('-selected', 'gi');
		imageSrc = imageSrc.replace(re, '');
		image.src = imageSrc;
	}
}