function refreshcaptcha() {
	img = document.getElementById('captcha'); 
	img.src = 'captcha.php?' + Math.random();
}

function _onfocus_emailaddress(obj) {

	if (obj.value == "email adres") {	
		obj.value = "";
		obj.style.color='#000000';	
	}	
}	
	
function _onblur_emailaddress(obj) {

	if (obj.value == "") {	
		obj.value = "email adres";
		obj.style.color='#7c7c7c';
	}	
}	




function do_logon(salt_password) {	
 document.getElementById('login_postwachtwoord').value = sha1hash(salt_password + ':' + sha1hash(document.getElementById('login_emailadres').value.toLowerCase() + ':' + document.getElementById('login_wachtwoord').value));
	document.getElementById('login_wachtwoord').value = '';
	return true;
}


var LoadHandler = {
  handlers:[],
  add:function(fn){
    if(window.onload!=LoadHandler.theHandler) LoadHandler._push(window.onload);
    LoadHandler._push(fn);
    window.onload=LoadHandler.theHandler;
  },
  _push:function(fn){
    if(typeof(fn)!='function') return;
    LoadHandler.handlers[LoadHandler.handlers.length]=fn;
  },
  theHandler:function(){
    var handlers=LoadHandler.handlers,i=-1,fn;
    while(fn=handlers[++i]) fn();
  }
}	
	


function sha1hash(msg)
{

    var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];

    msg += String.fromCharCode(0x80);

    var l = Math.ceil(msg.length/4) + 2; 
    var N = Math.ceil(l/16);              
    var M = new Array(N);
    for (var i=0; i<N; i++) {
        M[i] = new Array(16);
        for (var j=0; j<16; j++) {
            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
        }
    }

    M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
    M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;

    var H0 = 0x67452301;
    var H1 = 0xefcdab89;
    var H2 = 0x98badcfe;
    var H3 = 0x10325476;
    var H4 = 0xc3d2e1f0;

    var W = new Array(80); var a, b, c, d, e;
    for (var i=0; i<N; i++) {

        for (var t=0;  t<16; t++) W[t] = M[i][t];
        for (var t=16; t<80; t++) W[t] = ROTL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);

        a = H0; b = H1; c = H2; d = H3; e = H4;

        for (var t=0; t<80; t++) {
            var s = Math.floor(t/20);
            var T = (ROTL(a,5) + f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
            e = d;
            d = c;
            c = ROTL(b, 30);
            b = a;
            a = T;
        }


        H0 = (H0+a) & 0xffffffff; 
        H1 = (H1+b) & 0xffffffff; 
        H2 = (H2+c) & 0xffffffff; 
        H3 = (H3+d) & 0xffffffff; 
        H4 = (H4+e) & 0xffffffff;
    }

    return H0.toHexStr() + H1.toHexStr() + H2.toHexStr() + H3.toHexStr() + H4.toHexStr();
}


function f(s, x, y, z) 
{
    switch (s) {
    case 0: return (x & y) ^ (~x & z);
    case 1: return x ^ y ^ z;
    case 2: return (x & y) ^ (x & z) ^ (y & z); 
    case 3: return x ^ y ^ z;                    
    }
}

function ROTL(x, n)
{
    return (x<<n) | (x>>>(32-n));
}

Number.prototype.toHexStr = function()
{
    var s="", v;
    for (var i=7; i>=0; i--) { v = (this>>>(i*4)) & 0xf; s += v.toString(16); }
    return s;
}




function changeInputType(oldElm, iType, iValue, blankValue, noFocus) {
  
  if(!oldElm || !oldElm.parentNode || (iType.length<4) || 
    !document.getElementById || !document.createElement) return;
  var isMSIE=/*@cc_on!@*/false;

    var newElm=document.createElement('span');
    newElm.innerHTML='<input type="' + iType + '" name="' + oldElm.name + '" STYLE="color: #7c7c7c; height: 21px; padding-left: 5px; border: #7c7c7c 1px solid; width: 170px; font-size: 12px; font-family: trebuchet ms; vertical-align: middle;">';
    newElm=newElm.firstChild;

  var props=['name','id','className','size','tabIndex','accessKey'];
  for(var i=0,l=props.length;i<l;i++){
    if(oldElm[props[i]]) newElm[props[i]]=oldElm[props[i]];
  }
  newElm.onfocus=function(){return function(){
    if(this.hasFocus) return;
    var newElm=changeInputType(this,'password',iValue,
      (this.value.toLowerCase()==iValue.toLowerCase())?true:false);
	  newElm.style.color='#000000';
    if(newElm) newElm.hasFocus=true;
  }}();
  newElm.onblur=function(){return function(){
    if(this.hasFocus)
    if(this.value=='' || (this.value.toLowerCase()==iValue.toLowerCase())) {
      changeInputType(this,'text',iValue,false,true);
    }
  }}();

  newElm.hasFocus=false;

  if(!blankValue) newElm.value=iValue;
  oldElm.parentNode.replaceChild(newElm,oldElm);
  if(!isMSIE && !blankValue) {
	newElm.value=iValue;}
  if(!noFocus || typeof(noFocus)=='undefined') {
    window.tempElm=newElm;
    setTimeout("tempElm.hasFocus=true;tempElm.focus();",1);
  }
  return newElm;
}