function switchTab(showNo){	
	curentTab = new Number(curentTab);
	showNo = new Number(showNo);
		
	if(curentTab < showNo){	
			
		
		if(!checkInputs('strana' + curentTab)){
			return false;
		}
		
		for (xx=0; xx<showNo; xx++) {		
			//alert(i);
			if(!checkInputs('strana' + xx)){
				showNo = xx;
				break;
			}
		}
		
	} 

	curentTab = showNo;		
	unset('tab', 5, 'setActive');
	unset('strana', 5, 'hide', '');	
	document.getElementById('tab' + showNo).className  = 'aktiv';
	document.getElementById('strana' + showNo).style.display = 'block';
	
	return false;
}

function unset(prefix, count, action, extra){	
	for(i = 0; i<count; i++){
		o = document.getElementById(prefix + i);
		if(o){
			switch(action){
				case 'hide':
					o.style.display = 'none';
					break;
				case 'setActive':
					o.className  = extra;
					break
			}
		}		
	}
}

function checkInputs(id){
	i = 1;	
	if(BrowserDetect.browser == 'Explorer'){
		i = 0;
	}
	try{
		abch = document.getElementById('chb1').checked;
	}	catch(err) { abch = false; }
	
	fObj = document.getElementById(id).childNodes[i];
	//alert(fObj.name);
	for (i=0; i<fObj.childNodes.length; i++) {
		e = fObj.childNodes[i];		
		if (e.type == 'text' && e.name != 'nazev' && e.id != 'funkce' && !e.disabled) {
			if(e.value == ''){				
				alert('Vyplňte prosím všechny položky.');
				return false;
			}
		}		
	}	
	
	try{
		abv = document.getElementById('airbag').value;
	}	catch(err) { abv = ''; }
	
	if(id == 'strana2' && abv == '' && abch){
		alert('Vyplňte prosím počet airbagů.');
		return false;
	}
	
	return true;
}

function copyValue(sourceId, targetId){	
	s = document.getElementById(sourceId);
	t = document.getElementById(targetId);
	if(t.value == ''){
		t.value = s.value;
	}
} 

function disable(targetId){	
	t = document.getElementById(targetId);
	t.disabled = true;
} 

function undisable(targetId){	
	t = document.getElementById(targetId);
	t.disabled = false;
}

var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();