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 layerOn( 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
			
				vis.visibility = 'visible';
			}
			
			function layerOff( 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
			
				vis.visibility = 'hidden';
			}
			
			


		var revert = new Array();

		var inames = new Array('nav_left', 'nav_right','but_photo','but_documentary','but_blog','but_email','but_sitedesign');

		

		// Preload

		if (document.images) {
		  var flipped = new Array();
		  for(i=0; i< inames.length; i++) {
		    flipped[i] = new Image();
		    flipped[i].src = "images/"+inames[i]+"1.jpg";
		  }
		}

		

		function over(num) {
		  if(document.images) {
		    revert[num] = document.images[inames[num]].src;
		    document.images[inames[num]].src = flipped[num].src;
		  }

		}

		function out(num) {
		  if(document.images) document.images[inames[num]].src = revert[num];
		}