function getObj(name) {
		  if (document.getElementById)	{    	// DOM level 1 browsers: IE 5+, NN 6+
			this.obj = document.getElementById(name);
			this.style = document.getElementById(name).style;
		  }
		  else if (document.all)	{  			// IE 4
			this.obj = document.all[name];
			this.style = document.all[name].style;
		  }
		  else if (document.layers)  { 			// NN 4
			this.obj = document.layers[name];
			this.style = document.layers[name];
		  }
		}

		function viewDHTMLelements(elementName,control) {
			var displayedElement = new getObj(elementName);		
			eval("displayedElement.style.visibility = '"+control+"'");			
		}

		function showWindow(elementName) {
			viewDHTMLelements(elementName,"visible")
		}

		function closeWindow(elementName) {
			viewDHTMLelements(elementName,"hidden")
		}