if(navigator.appVersion.charAt(0) >=3){
	var btnimg = new Array();

	for( i = 0 ; i < 4 ; i++ ){
		btnimg[i] = new Image();
	}
	btnimg[0].src= "images/index_enter0.gif";
	btnimg[1].src= "images/index_enter1.gif";
	btnimg[2].src= "images/index_exit0.gif";
	btnimg[3].src= "images/index_exit1.gif";

}

function paintBtn(dim,cnt){
    if(navigator.appVersion.charAt(0) >= 3 ){
        document.images[dim].src=btnimg[cnt].src;
    }
}