var img = new Array( 'header_home3.jpg','header_home2.jpg','header_home4.jpg');

function show_img(){
	var d = document, obj = document.getElementById('image'), c = d.cookie, pos, pos2, new_pos = 0;
	if ( obj && img.length > 0 ){
		if ((( pos = c.indexOf('image_header=')) != -1 )){
			pos2 = c.indexOf( ';', pos );
			pos2 = ( pos2 != -1 ? pos2 : c.length );
			var str = c.substring( pos + 13, pos2 );
			if ( str != '' ){
				try{
					++ str;
					new_pos = ( str >= img.length ? 0 : str );
					
					flag = false;
				} catch(e){
				}
			}
		}
		d.cookie = 'image_header=' + new_pos;
		obj.src = 'img/' + img[ new_pos ];
	}
}