function preLoad(){
	navImage = new Array();
	for (n=0; n<=6; n++){
		navImage[n] = new Array();
		navImage[n][0] = new Image();
		navImage[n][1] = new Image();
	}
	navImage[0][0].src = '../images/b_logo.jpg';
	navImage[0][1].src = '../images/b_logo_f2.jpg';
	navImage[1][0].src = '../images/b_about.jpg';
	navImage[1][1].src = '../images/b_about_f2.jpg';
	navImage[2][0].src = '../images/b_staffing.jpg';
	navImage[2][1].src = '../images/b_staffing_f2.jpg';
	navImage[3][0].src = '../images/b_join.jpg';
	navImage[3][1].src = '../images/b_join_f2.jpg';
	navImage[4][0].src = '../images/b_news.jpg';
	navImage[4][1].src = '../images/b_news_f2.jpg';
	navImage[5][0].src = '../images/b_contact.jpg';
	navImage[5][1].src = '../images/b_contact_f2.jpg';
	navImage[6][0].src = '../images/b_search.jpg';
	navImage[6][1].src = '../images/b_search_f2.jpg';
}
function imageOn(imageObj){
	imageID = imageObj.id;
	idPattern = /\d+/;
	imageA = idPattern.exec(imageID);
	n = imageA[0];
	imageObj.src = navImage[n][1].src;
}
function imageOff(imageObj){
	imageID = imageObj.id;
	idPattern = /\d+/;
	imageA = idPattern.exec(imageID);
	n = imageA[0];
	imageObj.src = navImage[n][0].src;
}
onload = preLoad;