//tabnavigation Pressemitteilungen
function displayMeldungen(meldung, element_li){
	
	document.getElementById(meldung).style.display = 'block';
		if(element_li == 'li_right'){
			document.getElementById(element_li).className = 'li_selected_left';
		}
		else{
			document.getElementById(element_li).className = 'li_selected_right';
		}

	//setzt die nicht anzuzeigenden Inhalte auf display='none'
	var unterelement = document.getElementById(meldung);
	var parentNode = unterelement.parentNode;
	if(parentNode){
		if(parentNode.hasChildNodes()){
			var kinder = parentNode.childNodes;
			var kinder_length=kinder.length;
			for(i=0; i< kinder_length;i++){
				if (kinder[i].nodeType == 1){
						if(kinder[i] != unterelement){
							kinder[i].style.display='none';
						}
				}
			}
		}
	}
	
	setStyleClass(element_li);
	
	var changeAction = document.getElementById('formTab');
	
	if (changeAction) {
		if (meldung == "tab_0") {
			changeAction.action = "?tabNr=0";
		} else if (meldung == "tab_1") {
			changeAction.action = "?tabNr=1";
		} else if (meldung == "tab_2") {
			changeAction.action = "?tabNr=2";
		} else if (meldung == "tab_3") {
			changeAction.action = "?tabNr=3";
		} else {
			changeAction.action = "?tabNr=0";
		}
	}
}
//regelt die Style-Klassen der tabs
function setStyleClass(element_li){
	var element_li = document.getElementById(element_li);
	var tabnavigation = document.getElementById('tabnavigation');
	var tabnavigation_breit = document.getElementById('tabnavigation_breit');
	if(tabnavigation){
		var tab = tabnavigation;
	}
	else{
		var tab = tabnavigation_breit;
	}

	if(tab){
		if(tab.hasChildNodes()){
			var kinder_tab = tab.getElementsByTagName('ul');
			var kinder_tab_length=kinder_tab.length;
			for(j=0; j< kinder_tab_length;j++){
				if (kinder_tab[j].nodeType == 1){
						var kinder_element = kinder_tab[j].getElementsByTagName('li');
						var kinder_element_length=kinder_element.length;
						for(k=0; k< kinder_element_length;k++){
							if(kinder_element[k].nodeType == 1){
								if(kinder_element[k] != element_li){
									if(k == 0){
										kinder_element[k].className = 'left';
									}
									else if(k+1 == kinder_element_length ){
										kinder_element[k].className = 'right';
									}
									else{
										kinder_element[k].className = 'middle';
									}
								}
							}
						}
				}
			}
		}
	}
}
function widthTabnavigation(){
	var tabnavigation = document.getElementById('tabnavigation');
	var tabnavigation_breit = document.getElementById('tabnavigation_breit');
	if(tabnavigation){
		var width_tab =tabnavigation.offsetWidth;
		var tab = tabnavigation;
	}
	else{
		var width_tab =tabnavigation_breit.offsetWidth;
		var tab = tabnavigation_breit;
	}
	if(width_tab){
			var kinder_tab = tab.getElementsByTagName('ul');
			if(kinder_tab){
				var kinder_li = tab.getElementsByTagName('li');
				var kinder_li_length = kinder_li.length;
				if(kinder_li){
						var width_li = width_tab/ kinder_li_length;
						for(i=0; i<kinder_li_length;i++){
								kinder_li[i].style.width= width_li - kinder_li.length +'px';
						}
				}
			}
	}
}