var menuitems = new Array('overview','technical-specifications','faq','demos');		
		
			function SetProductsNav(navindex){
				/* height fix */
				document.getElementById('column-center').style.height = "auto";
				
				for (var i = 0; i < menuitems.length; i++) {			
					/* turn nav items off */	
					var nav = document.getElementById('nav-'+menuitems[i]);
					nav.className = 'off';		
					
					/* hide content */
					var content = document.getElementById('content-'+menuitems[i]);
					content.style.display = 'none';																	
				}						
				
				/* set nav on */
				var navon = document.getElementById('nav-'+menuitems[navindex-1]);
				navon.className = 'on';	
				
				/* show content */
				var contenton = document.getElementById('content-'+menuitems[navindex-1]);
				contenton.style.display = 'block';					
					
				/* fix column heights */
				equalHeights();
	
			}
			
			function gup( name )			{
			  name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
			  var regexS = "[\\?&]"+name+"=([^&#]*)";
			  var regex = new RegExp( regexS );
			  var results = regex.exec( window.location.href );
			  if( results == null )
				return "";
			  else
				return results[1];
			}