function toggleLayers(numbr) {
    //IE 5.5+ & NN 6.1+
    var numLayers = 18 // Set this to the Total number of layers
    var onLayer = 'Layer' + numbr
    if (document.getElementById) {
        //hide all layers
        for (i=0; i<numLayers; i++) {
        var lyr = 'Layer' + i
        eval("document.getElementById(lyr).style.display = 'none'"); // Hides all layers
        eval("document.getElementById(i).className ='tab'"); // All links to have 'tab' style
        }
    //Show selected layer
    eval("document.getElementById(onLayer).style.display = '' ");
    eval("document.getElementById(numbr).className ='tabon'"); // Selected link has 'tabon' style
    }    
}