// Tab navigation 
var timer1;
var selectedTab;
var tab_arr = new Array("tab_home","tab_pregnant","tab_heart", "tab_health","tab_products");
// group : all checkboxes with class chb in parent div with id="groepsnaam"			  
var tab_class_arr = new Array();

	
	
function initTabNav() {
	if (document.getElementById) {
		timer1=setTimeout("",0);
		for ( var i=0; i<tab_arr.length; i++) {
			var o = document.getElementById(tab_arr[i]);
			tab_class_arr[i] = "tab_lv1";
			if (o.className == "tab_lv1_sel") { tab_class_arr[i] = "tab_lv1_sel"; selectedTab = o.id; break; }
			
		}
		initSub();
	}
}

function initSub() {
	if (document.getElementById) {
		clearTimeout(timer1);
		for ( var i=0; i<tab_arr.length; i++) {
			var lv2 = document.getElementById("sub"+tab_arr[i]);
			var lv1 = document.getElementById(tab_arr[i]);
			if (lv2) { 
			    
				if (lv2.id == "sub"+selectedTab) {
				    lv1.className = "tab_lv1_sel" ; 
					if (lv2.className!="tabs_lv2_blank") { lv2.className = "tabs_lv2_sel"; }
					lv2.style.display = "block"; 	
				} else { 
					lv2.style.display = "none"; 
					lv1.className = "tab_lv1" ;
				}
			}
		}
	}
}

function showSub(tab) {
	
	clearTimeout(timer1);
	if (document.getElementById) {
		for ( var i=0; i<tab_arr.length; i++) {
			
			var lv1 = document.getElementById(tab_arr[i]);
			var lv2 = document.getElementById("sub"+tab_arr[i]);
			if ( lv2 ) {
				if (lv1.id != selectedTab ) {
					
					if (lv2.id == "sub"+tab.id) { 
					lv2.style.display = "block"; lv1.className = "tab_lv1_over" ; 
					}
					else { lv2.style.display = "none"; lv1.className = "tab_lv1" ; }
					
					
					
				} else { 
					lv2.style.display = "none";
					lv1.className = "tab_lv1";/*tab_class_arr[i]*/
					
				}
			}
		}
	}	
}

function hideSub() {
	if (document.getElementById) { 
		timer1=setTimeout('initSub();',400);
	}
} 

function ct() {
	if (document.getElementById) {
		clearTimeout(timer1);
	}
}