var isIMG = document.images;
var bon;
var boff;

if (isIMG) {
bon = new Image(); 
boff = new Image();   
}

function anchor(anchor) {
	if (isIMG) {
    	document[anchor].src = (document[anchor].src.indexOf('../cargo/images/images_all/arrow_light.gif') != -1) ? '../cargo/images/images_all/arrow_dark.gif' : '../cargo/images/images_all/arrow_light.gif';
        }
}

function GotoTop(gototop) {
	if (isIMG) {
		document[gototop].src = (document[gototop].src.indexOf('../cargo/images/images_all/gototop_arrow_over.gif') != -1) ? '../cargo/images/images_all/gototop_arrow_out.gif' : '../cargo/images/images_all/gototop_arrow_over.gif';
    }
}

function LFolder(map1) {
	if (isIMG) {
		document[map1].src = (document[map1].src.indexOf('../cargo/images/images_map/Lfolder_over.gif') != -1) ? '../cargo/images/images_map/Lfolder_out.gif' : '../cargo/images/images_map/Lfolder_over.gif';
    }
}

function BlueFolder(map2) {
	if (isIMG) {
		document[map2].src = (document[map2].src.indexOf('../cargo/images/images_map/bluefolder_over.gif') != -1) ? '../cargo/images/images_map/bluefolder_out.gif' : '../cargo/images/images_map/bluefolder_over.gif';
    }
}

function BlueSquare(map3) {
	if (isIMG) {
		document[map3].src = (document[map3].src.indexOf('../cargo/images/images_map/bluesquare_over.gif') != -1) ? '../cargo/images/images_map/bluesquare_out.gif' : '../cargo/images/images_map/bluesquare_over.gif';
    }
}

function GrayFolder(map4) {
	if (isIMG) {
		document[map4].src = (document[map4].src.indexOf('../cargo/images/images_map/grayfolder_over.gif') != -1) ? '../cargo/images/images_map/grayfolder_out.gif' : '../cargo/images/images_map/grayfolder_over.gif';
    }
}

function GraySquare(map5) {
	if (isIMG) {
		document[map5].src = (document[map5].src.indexOf('../cargo/images/images_map/graysquare_over.gif') != -1) ? '../cargo/images/images_map/graysquare_out.gif' : '../cargo/images/images_map/graysquare_over.gif';
    }
}