function switchImageOnLink(elementToSwitch,io){
	
	
	var directory;
	var image;
	var extension;
	var element = document.getElementById(elementToSwitch);
	var element2 = element.getElementsByTagName("a");

	//sets the extension for the file
	if(io==0){extension = "Alt.png";}else{extension = ".png";}
	
	//image decleration
	if(elementToSwitch.indexOf("home") !=-1){image = "home" + extension;}
	if(elementToSwitch.indexOf("about") !=-1){image = "about"  + extension;}
	if(elementToSwitch.indexOf("gallery") !=-1){image = "gallery"  + extension;}
	if(elementToSwitch.indexOf("exhib") !=-1){image = "exhib"  + extension;}
	if(elementToSwitch.indexOf("contact") !=-1){image = "contact"  + extension;}
	if(elementToSwitch.indexOf("links") !=-1){image = "links"  + extension;}
	
	//finds directory
	if(elementToSwitch.charAt(elementToSwitch.length-1) == 'T'){
		directory = "textMenu";
	}else{ 
		directory = "graphicMenu";
	}
	
	//sets the image backgroun
	element2[0].setAttribute("style", "background: url(images/" + directory + "/" + image + ")");
	//element2[0].style.background = "url(images/" +directory+ "/" + image + ")";
}// JavaScript Document