/* show and hide divs based upon form selections. Used for 
   interactive Product Selector */
   
var currentLayer = 'start';
function showLayer(lyr) {
   hideLayer(currentLayer);
   document.getElementById(lyr)
      .style.visibility = 'visible';
   currentLayer = lyr;
}

function hideLayer(lyr) {
   document.getElementById(lyr).
      style.visibility = 'hidden';
}

function errorAlert() {
alert("You must make a selection")
}