<!--
			function invert(propertyLayer){
				var displayproperty='';
				
				eval('displayproperty='+propertyLayer+'.style.display;');
				
				if (displayproperty=="none"){
					eval(propertyLayer+'.style.display="block";');
				}else{
					eval(propertyLayer+'.style.display="none";');
				}
			}

-->