// JavaScript Document
function checkFontSize()
{
	//lees cookie
	var x = readCookie('fontcookie');
	if(x) {
		document.getElementById('content').style.fontSize = x;
  		//document.getElementById('topnav').style.fontSize = x;
	}
	else { 
		document.getElementById('content').style.fontSize = 10;
  		//document.getElementById('topnav').style.fontSize = 10;
	}
}

function changeFontSize(inc)
{
  if(document.getElementById('content').style.fontSize)
  {
	var size = parseInt(document.getElementById('content').style.fontSize.replace("px", ""));
  } else {
	var size = 11;  
  }
  document.getElementById('content').style.fontSize = size+inc+ 'px';
  //document.getElementById('topnav').style.fontSize = size+inc+ 'px';
  
  //set cookie met nieuwe fontsize
  createCookie('fontcookie',size+inc+'px',365);
}
  
function resetFontSize()
{
	var x = eraseCookie('fontcookie');
	document.getElementById('content').style.fontSize = 10+'px';
  	//document.getElementById('topnav').style.fontSize = 10+'px';
}
	

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}


  //var p = document.getElementsByTagName('div');
  //for(n=0; n<p.length; n++) {
  //  if(p[n].style.fontSize) {
  //     var size = parseInt(p[n].style.fontSize.replace("px", ""));
  //  } else {
  //     var size = 12;
  //  }
  //  p[n].style.fontSize = size+inc + 'px';
  // }
//}

//functies voor enqueteformulieren

function cijfers(evt) {
	var charCode = (evt.which) ? evt.which : evt.keyCode;
	if ((charCode >= 48 && charCode <=57) || charCode == 8){
		return true; } // Alleen maar cijfers en backspace toegestaan
	return false;
}

function vraagverderja(question, objnameja, objnamenee) {
	if(	document.getElementById(question).value == 'ja') { slidedown(objnameja); slideup(objnamenee);  }
	 
}
function vraagverdernee(question, objnamenee, objnameja) {
	if(	document.getElementById(question).value == 'nee') { slidedown(objnamenee); slideup(objnameja); } 
}