var showState = 'hidden';
var zIndex1;
var xSize;
var ySize;

function showHideMap(id1) {
    if (showState == 'visible') {
        showState = 'hidden';
        zIndex1 = 0;
        xSize = '0px';
        ySize = '0px';
    }
    else {
        showState = 'visible';
        zIndex1 = 93;
        xSize = '577px';
        ySize = '320px';
    }

    if (document.all) { //IS IE 4 or 5 (or 6 beta)
        eval( "document.all." + id1 + ".style.visibility = showState");
        eval( "document.all." + id1 + ".style.zIndex = zIndex1");
        eval( "document.all." + id1 + ".style.height = ySize");
        eval( "document.all." + id1 + ".style.width = xSize");
    }

    if (document.layers) { //IS NETSCAPE 4 or below
        document.layers[id1].visibility = showState;
        document.layers[id1].zIndex = zIndex1;
        document.layers[id1].height = ySize;
        document.layers[id1].width = xSize;
    }

    if (document.getElementById && !document.all) {
        elem1 = document.getElementById(id1);
        elem1.style.visibility = showState;
        elem1.style.zIndex = zIndex1;
        elem1.style.height = ySize;
        elem1.style.width = xSize;
    }
}