//redimensiona el thickbox con una animación
function tb_resize(height) {
	current_height = parseInt(window.top.$("#TB_iframeContent").css("height"));
	next_height = height;
	height_difference = current_height - next_height;

	current_margin = parseInt(window.top.$("#TB_window").css("margin-top"));
	next_margin = Math.floor(current_margin + (height_difference/2));

	window.top.$("#TB_iframeContent").css("height",next_height+"px");

	window.top.$("#TB_window").css("margin-top",next_margin+"px");
}