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;}}