function toggleLayer(whichLayer)
{if(document.getElementById)
{var style2=document.getElementById(whichLayer).style;style2.display=style2.display?"":"block";}
else if(document.all)
{var style2=document.all[whichLayer].style;style2.display=style2.display?"":"block";}
else if(document.layers)
{var style2=document.layers[whichLayer].style;style2.display=style2.display?"":"block";}}