// Sample:
// <img src="images/home.jpg" id="home-btn" onMouseOver="mnuOvr_doOvr(this.id,1)" onMouseOut="mnuOvr_doOvr(this.id,0)">

var mnuOvr_imgList = new Array('home','portfolio','services','partners','about','contact');		// Create simple list of buttons
var mnuOvr_targetFolderLocation = 'images/menu/';			// Set image target folder (can be relative folder)
var mnuOvr_targetFileExtension = '.png';				// File extension to be used (MUST include leading '.')
var mnuOvr_targetOverIdentifier = '-ovr'				// Text added to filename to signify mouseover graphic
var mnuOvr_targetImageIdentifier = '-btn'				// Text added to image ID beyond image list name

// -- End of user options --

var mnuOvr_mnuArray = new Array();

function mnuOvr_buildImgArray(mnuOvr_inArr) {
	if (document.images) {
		for ( var mnuOvr_i in mnuOvr_inArr ) {
			mnuOvr_tmpObjName = mnuOvr_inArr[mnuOvr_i] + mnuOvr_targetImageIdentifier;
		    mnuOvr_mnuArray[mnuOvr_tmpObjName] = new Array();
			mnuOvr_mnuArray[mnuOvr_tmpObjName][0] = new Image();
			mnuOvr_mnuArray[mnuOvr_tmpObjName][1] = new Image();
			mnuOvr_mnuArray[mnuOvr_tmpObjName][0].src = mnuOvr_targetFolderLocation + mnuOvr_inArr[mnuOvr_i] + mnuOvr_targetFileExtension;
			mnuOvr_mnuArray[mnuOvr_tmpObjName][1].src = mnuOvr_targetFolderLocation + mnuOvr_inArr[mnuOvr_i] + mnuOvr_targetOverIdentifier + mnuOvr_targetFileExtension;
		}
	}
}

function mnuOvr_doOvr(mnuOvr_img,mnuOvr_state) {
	if (document.images) {
		document.getElementById(mnuOvr_img).src = mnuOvr_mnuArray[mnuOvr_img][mnuOvr_state].src;
	}
}

mnuOvr_buildImgArray(mnuOvr_imgList);