var myImg = [
	{idn:'b', dir:'index'}, 
	{idn:'c', dir:'about-us'}, 
	{idn:'d', dir:'patient-center'},
	{idn:'e', dir:'services'}, 
	{idn:'f', dir:'patient-comments'}];

var imageObjA = new Object();
for (i=0;i<myImg.length;i++) {
	imageObjA[myImg[i].idn + '_over'] = new Image();
	imageObjA[myImg[i].idn + '_over'].src = '/images/nav/nav_over_' + myImg[i].idn + '.gif';
	imageObjA[myImg[i].idn + '_off'] = new Image();
	imageObjA[myImg[i].idn + '_off'].src = '/images/nav/nav_off_' + myImg[i].idn + '.gif';
	imageObjA[myImg[i].idn + '_on'] = new Image();
	imageObjA[myImg[i].idn + '_on'].src = '/images/nav/nav_on_' + myImg[i].idn + '.gif';
}

function imageOn (imageObj) { 
	imageObj.src = imageObjA[imageObj.id + '_over'].src;
	setPageImageOn ();
}

function imageOff (imageObj) { 
	imageObj.src = imageObjA[imageObj.id + '_off'].src;
	setPageImageOn ();
}

function setPageImageOn () {
	var mypath = new Array();
	var loc = location.pathname;
	
	mypath = loc.split('/');
	//alert(mypath[1]);
	mypath[1] = ((mypath[1]=='index.html')||(mypath[1]==''))?'index':mypath[1];
	for (i=0;i<myImg.length;i++) {
		if (myImg[i].dir==mypath[1]) {
			//alert (myImg[i].dir + ' - ' + mypath[1]);
			document.getElementById(myImg[i].idn).src = imageObjA[myImg[i].idn + '_on'].src;
		}
	}
}