function initStyle(){
	if(typeof(doLoaded) != "undefined"){doLoaded();}
	chgIMG();
}

function chgIMG(){
bcimg = new Array(3);

bcimg[0] = 'url("http://template.cocolog-nifty.com/000328/three_column/component/banner-bg1.jpg")';
bcimg[1] = 'url("http://template.cocolog-nifty.com/000328/three_column/component/banner-bg1.jpg")';
bcimg[2] = 'url("http://template.cocolog-nifty.com/000328/three_column/component/banner-bg2.jpg")';

rnd = Math.floor(Math.random() * bcimg.length);

document.getElementById("banner").style.backgroundImage = bcimg[rnd];

}