function toggleLayer( whichLayer )
{  var elem, vis;  if( document.getElementById ) // this is the way the standards work    
elem = document.getElementById( whichLayer );  
else if( document.all ) // this is the way old msie versions work      
elem = document.all[whichLayer];  
else if( document.layers ) // this is the way nn4 works    
elem = document.layers[whichLayer];  vis = elem.style;  // if the style.display value is blank we try to figure it out here  

if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';  vis.display = (vis.display==''||vis.display=='block')?'none':'block';}

function switch1(div) {
var option=['automotive','commercial','residential'];
for(var i=0; i<option.length; i++) {
if (document.getElementById(option[i])) {
obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div)? "block" : "none";
}
}
}

window.onload=function () {switch1('automotive');}
// JavaScript Document