var state="none";function showhide(layer_ref){if(state=="block"){state="none"}else{state="block"}if(document.all){eval("document.all."+layer_ref+".style.display = state")}if(document.layers){document.layers[layer_ref].display=state}if(document.getElementById&&!document.all){hza=document.getElementById(layer_ref);hza.style.display=state}};