function init()
{
	beforeId = 1;
	gzoneImage = new Array(6);
	gzoneImage[0] = "top_01_hello.jpg";
	gzoneImage[1] = "top_t_correction.jpg";
	gzoneImage[2] = "top_t_readbook.jpg";
	gzoneImage[3] = "top_t_takecar.jpg";
	gzoneImage[4] = "top_t_forum.jpg";
	gzoneImage[5] = "top_t_information.jpg";
	preLoadImg = new Array(5);
	for(i=0;i<=5;i++){
		preLoadImg[i]		= new Image();
		preLoadImg[i].src	= "/obj-2007/"+gzoneImage[i];
	}
}


function set_img(areaID,imgFileName)
{
	document.getElementById(areaID).style.backgroundImage = imgFileName; 
}


function set_menu_obj(id)
{
	document.getElementById("gzone-summary").innerHTML = gzoneSummary[id];
	set_img("gzone-top","url(/obj-2007/"+gzoneImage[id]+")");
}