var intervalId = 0;
var timerId = 0;
var huidigeTab = 1;

function blogpagenumber(nummer,timerOn){

	
	var posts = getElementsByClassName(document, "div", "tabelement"); 
	for(var i=0; i<posts.length; i++){
		posts[i].style.display= "none";
	}
	
	var postsshow = getElementsByClassName(document, "div", "tabgroup"+nummer); 
	for(var i=0; i<postsshow.length; i++){
		postsshow[i].style.display= "inline";
	}
}

function startInterval(){
	intervalId = setInterval ( "volgendeTab()", 10000 );
}

function stopInterval(){
	clearInterval(intervalId);	
}

function volgendeTab(){
	huidigeTab++;
	nextTab = getElementsByClassName(document, "div", "tabgroup"+huidigeTab);
	if(huidigeTab >= 6 || nextTab.length == 0){huidigeTab = 1;}
	blogpagenumber(huidigeTab,false);
}

function vorigeTab(){
	huidigeTab--;
	
	if(huidigeTab == 0){
		for(var i=0; i<5;i++){
			nextTab = getElementsByClassName(document, "div", "tabgroup"+i);
			if(nextTab.length != 0){
				huidigeTab = i;
			}
		}
	}
	blogpagenumber(huidigeTab,false);
}

	

function getElementsByClassName(oElm, strTagName, oClassNames){

	var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);

	var arrReturnElements = new Array();

	var arrRegExpClassNames = new Array();

	if(typeof oClassNames == "object"){

		for(var i=0; i<oClassNames.length; i++){

			arrRegExpClassNames.push(new RegExp("(^|\\s)" + oClassNames[i].replace(/\-/g, "\\-") + "(\\s|$)"));

		}

	}

	else{

		arrRegExpClassNames.push(new RegExp("(^|\\s)" + oClassNames.replace(/\-/g, "\\-") + "(\\s|$)"));

	}

	var oElement;

	var bMatchesAll;

	for(var j=0; j<arrElements.length; j++){

		oElement = arrElements[j];

		bMatchesAll = true;

		for(var k=0; k<arrRegExpClassNames.length; k++){

			if(!arrRegExpClassNames[k].test(oElement.className)){

				bMatchesAll = false;

				break;

			}

		}

		if(bMatchesAll){

			arrReturnElements.push(oElement);

		}

	}

	return (arrReturnElements)

	}

	

	

function writeAddr() {

	// Build the address

	var i,a=writeAddr.arguments,addr="";

	addr += a[0]+"@";

	for( i=1; i<a.length; i++ ) {

		if( i>1 ) addr += ".";

		addr += a[i];

	}

	// Write html to the browser with the email address

	document.write("<a href=\"mailto:" 

		+ addr + "\">" + addr + "</a>");

}