function opens(id)
				{
				document.getElementById(id).style.display='block';
				}
				function closes(id)
				{

				document.getElementById(id).style.display='none';
				}
				function loadtab()
				{
				
				    var args = GetParamValue();
				    var myTab = "1"; 
				    var myCode = "";
				    
				    if (args.t)
				    {
				        myTab = args.t.toString();
				    }
				    //alert("Here: 1 " + myTab);

				    myCode = "changeImage"+myTab+"();";
				    var myFn = new Function(myCode);
				    myFn();
				}
				function goToBookTab(myURL)
				{
				    var args = GetParamValue();
				    if (args.ID)
				    {
				    //alert("Here: 2 " + args.ID);
				        location.href = "http://" + location.hostname + location.pathname + "?ID=" + args.ID.toString() + "&t=" + myURL;
				    }
				}
				
				function GetParamValue() 
				{
				    var query = location.search.substring(1);
				    var parms = query.split('&');
				    var args = new Object();
				    
				    for (var i=0; i < parms.length; i++)
				    {
				        var pos = parms[i].indexOf('=');
				        if (pos > 0) {
				            var key = parms[i].substring(0,pos);
				            var val = parms[i].substring(pos+1);
				            args[key] = unescape(val);
				            //alert("Key: " + key + "; Val: " + val); 
				        }
				    }
				    return args;
				}
				    
				function changeImage1()
				{
				//alert("Here: 1");
					opens('1');
					closes('2');
					closes('3');
					closes('4');
					document.images['taboverview'].src='../images/tab_images/tab_overview1.gif';
					document.images['tabextras'].src='../images/tab_images/tab_extras2.gif';
					document.images['tabauthor'].src='../images/tab_images/tab_author0.gif';
					document.images['tabother'].src='../images/tab_images/tab_other0.gif';
				}
				function changeImage2()
				{
				//alert("Here: 2");
					closes('1');
					opens('2');
					closes('3');
					closes('4');
					document.images['taboverview'].src='../images/tab_images/tab_overview0.gif';
					document.images['tabextras'].src='../images/tab_images/tab_extras1.gif';
					document.images['tabauthor'].src='../images/tab_images/tab_author2.gif';
					document.images['tabother'].src='../images/tab_images/tab_other0.gif';
				}
				function changeImage3()
				{
				//alert("Here: 3");
					closes('1');
					closes('2');
					opens('3');
					closes('4');
					document.images['taboverview'].src='../images/tab_images/tab_overview0.gif';
					document.images['tabextras'].src='../images/tab_images/tab_extras0.gif';
					document.images['tabauthor'].src='../images/tab_images/tab_author1.gif';
					document.images['tabother'].src='../images/tab_images/tab_other2.gif';
				}
				function changeImage4()
				{
				//alert("Here: 4");
					closes('1');
					closes('2');
					closes('3');
					opens('4');
					document.images['taboverview'].src='../images/tab_images/tab_overview0.gif';
					document.images['tabextras'].src='../images/tab_images/tab_extras0.gif';
					document.images['tabauthor'].src='../images/tab_images/tab_author0.gif';
					document.images['tabother'].src='../images/tab_images/tab_other1.gif';
				}