openedNav="none";
function swapImages(img_name, img_src){
	if (document.images){
		document[img_name].src = img_src;
    }
}
function changeImages(img_name, img_src){
	swapImages(img_name, img_src);
}


/**********************************************************************
 insert random horizontal photo on the home page
 **********************************************************************/
function HomePageHorizontal(){
	var numOfPhotos = 4;
	var randNum = Math.ceil(Math.random()*numOfPhotos);
	document.write('<img src="images/h_home'+randNum+'.jpg">')
}

/**********************************************************************
 insert random vertical photo on the home page
 **********************************************************************/
function HomePageVertical(){
	var numOfPhotos = 4;
	var randNum = Math.ceil(Math.random()*numOfPhotos);
	document.write('<img src="images/v_cover_'+randNum+'.jpg">')
}