function doPreload()
{
tree01ad01=new Image(551,16); tree01ad01.src="images/front/school01.gif";

tree02ad01=new Image(551,16); tree02ad01.src="images/front/school02.gif";

tree03ad01=new Image(551,16); tree03ad01.src="images/front/school03.gif";

tree04ad01=new Image(551,16); tree04ad01.src="images/front/school04.gif";

tree05ad01=new Image(551,16); tree05ad01.src="images/front/school05.gif";

nav02off=new Image(134,45); nav02off.src="images/front/nav02.gif";
nav02on=new Image(134,45); nav02on.src="images/front/nav02_over.gif"; 

nav03off=new Image(134,56); nav03off.src="images/front/nav03.gif";
nav03on=new Image(134,56); nav03on.src="images/front/nav03_over.gif"; 

nav04off=new Image(134,48); nav04off.src="images/front/nav04.gif";
nav04on=new Image(134,48); nav04on.src="images/front/nav04_over.gif"; 
}
 
function imgActNav(imgName) {
    	document[imgName].src=eval(imgName + "on.src");
}

function imgInactNav(imgName) {
    	document[imgName].src=eval(imgName + "off.src");
} 
 
function swapSchool(imgName) {
    	document["school"].src=eval(imgName + "ad01.src");
}

function swapSchoolRestore(imgName) {
    	document["school"].src="images/front/school_name.gif";
}