function highlight(obj) {
			var el = document.getElementById(obj);
			//el.style.backgroundColor = '#666666';
			el.style.backgroundImage="url(/images/edit_this.gif)";
			el.style.backgroundPosition="left";
			el.style.backgroundRepeat="repeat";

		}

function unhighlight(obj) {
			var el = document.getElementById(obj);
			//el.style.backgroundColor = '#FFFFFF';
			el.style.backgroundImage="none";
		}
		

function getStyleObject(objectId) {
		  // checkW3C DOM, then MSIE 4, then NN 4.
		  //
		  if(document.getElementById && document.getElementById(objectId)) {
				return document.getElementById(objectId).style;
		   }
		   else if (document.all && document.all(objectId)) {  
				return document.all(objectId).style;
		   } 
		   else if (document.layers && document.layers[objectId]) { 
				return document.layers[objectId];
		   } else {
				return false;
		   }
		}
		
		function changeObjectVisibility(objectId, newVisibility) {
			// first get a reference to the cross-browser style object 
			// and make sure the object exists
			var styleObject = getStyleObject(objectId);
			if(styleObject) {
				styleObject.display = newVisibility;
				return true;
			} else {
				// we couldn't find the object, so we can't change its visibility
				return false;
			}
		}



		
		// function switchDiv()
		//  this function takes the id of a div
		//  and calls the other functions required
		//  to show that div
		//
		function switchDiv(obj, display) {
			var el = document.getElementById(obj);
			hideAll();
			el.style.display = 'block';
		}
		
		function showDiv(obj, display) {
			var el = document.getElementById(obj);
			hideAll();
			el.style.display = 'block';
		}
		function hideDiv(obj, display) {
			var el = document.getElementById(obj);
			hideAll();
			el.style.display = 'none';
		}
		// function hideAll()
		//  hides a bunch of divs
		//
		function hideAll()
		{
		   changeObjectVisibility("home_menu","none");
		   changeObjectVisibility("product_menu","none");
		   changeObjectVisibility("news_menu","none");
		   changeObjectVisibility("dentists_menu","none");
   		   changeObjectVisibility("literature_menu","none");
		   changeObjectVisibility("technicians_menu","none");
		   changeObjectVisibility("patients_menu","none");
		   changeObjectVisibility("about_menu","none");
		   changeObjectVisibility("training_menu","none");

		}
		
function do_postage()
{
	box = document.forms.postageselect.postage;
	destination = box.options[box.selectedIndex].value;
	if (destination) location.href = destination;
}


		
		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';
		}