/* --------------------------- uitbreiding body.onload: */
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}


/* ppk */
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);
//}

/* fontsize resizen: */
var INIT_SZ, MAX, MIN;

var init = function() {
	var fontsize = readCookie('fontsize');
	if(fontsize) {
		INIT_SZ = fontsize;
	
	} else {
		INIT_SZ = 1;
	}
	MAX = 1.4;
	MIN = 0.75;
	var elem = document.getElementsByTagName('body');
	elem[0].style.fontSize = INIT_SZ+"em";
	
	var tekst_kleiner = document.getElementById('tekst-kleiner');
	var tekst_groter = document.getElementById('tekst-groter');
	
	tekst_kleiner.onmousedown = function() {
		shrink();
	};
	
	tekst_groter.onmousedown = function() {
		enlarge();
	};
	

}

var enlarge = function() {  
	var elem = document.getElementsByTagName('body');
	var newsize = 1.1*(elem[0].style.fontSize.replace("em", ""));
	if(newsize < MAX) {
		elem[0].style.fontSize = newsize+"em";
		createCookie('fontsize',newsize,7);
	}
}

var shrink = function() {    
	var elem = document.getElementsByTagName('body');
	var newsize = (elem[0].style.fontSize.replace("em", ""))/1.1;
	if(newsize > MIN) {
		elem[0].style.fontSize = newsize+"em";
		createCookie('fontsize',newsize,7);
	}
}

var normalsize = function() {    
	var elem = document.getElementsByTagName('body');
	elem[0].style.fontSize = "0.7em";
	createCookie('fontsize',0.7,7);
}

addLoadEvent(init);