if (document.images) {
		bubble_1_off = new Image;
		bubble_1_on = new Image;
		bubble_2_off = new Image;
		bubble_2_on = new Image;
		bubble_3_off = new Image;
		bubble_3_on = new Image;

		bubble_1_off.src = "images/seafan_off.gif";
		bubble_1_on.src = "images/seafan_over.gif";
		bubble_2_off.src = "images/school_off.gif";
		bubble_2_on.src = "images/school_over.gif";
		bubble_3_off.src = "images/dolphin_off.gif";
		bubble_3_on.src = "images/dolphin_over.gif";

	} else {

		bubble_1_on = "";
		bubble_1_off = "";
		bubble_2_on = "";
		bubble_2_off = "";
		bubble_3_on = "";
		bubble_3_off = "";

		document.bubble_1 = "";
		document.bubble_2 = "";
		document.bubble_3 = "";

	}