function open_image(img_src){
	ImageWindow = window.open(img_src,"image_window",'scrollbars=yes,resizable=yes');
	ImageWindow.focus();
}

function open_link(src){
	popupWindow = window.open(src,"popup_window",'scrollbars=yes,status=yes,resizable=yes,width=750,height=500');
	popupWindow.focus();
}

function img_roll(id, src){
	img = document.getElementById (id);
	img.src = src;
}