var tabs = new Array("tab1-de", "tab2-de", "tab3-de" , "tab4-de", "tab5-de", "tab6-de", "tab1-ru", "tab2-ru", "tab3-ru" , "tab4-ru", "tab5-ru", "tab6-ru");
		var langs = new Array("de", "ru");
		
		function changeLang(lang) {
				 setLang(lang);
				 showTab("tab1-"+lang);
		}
		function setLang(lang) {
		    for (var i = 0; i < langs.length; i++) {
		    	//document.getElementById("menu-lang-"+langs[i]).style.display = 'none';
		    	if(document.getElementById("menu-"+langs[i])!=null)
		    	{
                document.getElementById("menu-"+langs[i]).style.display = 'none';
                }
                if(document.getElementById("logo-"+langs[i])!=null)
                {
                document.getElementById("logo-"+langs[i]).style.display = 'none';
                }
            }
            //document.getElementById("menu-lang-"+lang).style.display = 'block';
            document.getElementById("menu-"+lang).style.display = 'block';
            document.getElementById("menu-lang-de").style.display = 'block';
            document.getElementById("menu-lang-ru").style.display = 'block';
            document.getElementById("logo-"+lang).style.display = 'block';
        }
        
        function showTab(tid) {
            for (var i = 0; i < tabs.length; i++) {
            if(document.getElementById(tabs[i]+"-r")!=null)
            {
                document.getElementById(tabs[i]+"-r").style.display = 'none';
                }
                if(document.getElementById("content-"+tabs[i])!=null)
                {
                document.getElementById("content-"+tabs[i]).style.display = 'none';
                }
            }
            document.getElementById(tid+"-r").style.display = 'block';
            document.getElementById("content-"+tid).style.display = 'block';
        }
        
        function queryString(parameter) { 
            var loc = location.search.substring(1, location.search.length);
            var param_value = false;
            var params = loc.split("&");
            for (i=0; i<params.length;i++) {
                param_name = params[i].substring(0,params[i].indexOf('='));
    			if (param_name == parameter) {
                    param_value = params[i].substring(params[i].indexOf('=')+1)
                }
            }
            
			if (param_value) {
                return param_value;
            }
            else {
                return "null"; //Here determine return if no parameter is found
            }
        }
        //index.html?id=3
        //index.html?lang=de
        //index.html?lang=de&id=3
        function processQuery() {
            //get language parameter from url
            var lang=queryString('lang');
            
			if(lang==langs[0] || lang==langs[1]) {
            }
            else {
			    lang=langs[0];
			}
            
            //set language
            setLang(lang);
            
            //get id parameter from url
            var id=queryString('id');
            var tab = "tab1-"+lang;
            for (var i = 0; i < tabs.length; i++) {
				var tabtmp = "tab" + id + "-" + lang;
                if(tabs[i]==tabtmp) {
                    tab = tabtmp;
                    break;
				}
            }
            showTab(tab);
        }