var idxbtn = new Array();

for( i = 0 ; i < 4 ; i++ ){
	idxbtn[i] = new Image();
}

idxbtn[0].src= "images/idx_btn_main.jpg";
idxbtn[1].src= "images/idx_btn_main_01.jpg";
idxbtn[2].src= "images/idx_btn_main_02.jpg";
idxbtn[3].src= "images/idx_btn_main_03.jpg";

function idxbtnrollover(cnt){
	document.getElementById('idxbtnimg').src = idxbtn[cnt].src;
}