function buyThis(txt, urllink){
    var retval=confirm(txt);
    if(retval==true){
        window.location = urllink;
    } else {
        return;
    }
} 

function getWindowHeight() {
	var windowHeight=0;
	if (typeof(window.innerHeight)=='number') {
		windowHeight=window.innerHeight;
	} else {
		if (document.documentElement&&
			document.documentElement.clientHeight) {
			windowHeight=document.documentElement.clientHeight;
		} else {
			if (document.body&&document.body.clientHeight) {
				windowHeight=document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}

function getWindowWidth() {
	var windowWidth=0;
	if (typeof(window.innerWidth)=='number') {
		windowWidth=window.innerWidth;
	} else {
		if (document.documentElement&&
			document.documentElement.clientWidth) {
			windowWidth=document.documentElement.clientWidth;
		} else {
			if (document.body&&document.body.clientWidth) {
				windowWidth=document.body.clientWidth;
			}
		}
	}
	return windowWidth;
}

function setBackGround(id) {
	var x = getWindowWidth();
	var y = getWindowHeight();
	if ((x <= 800) && (y <= 600)) {
		document.body.background = '/backgrounds/'+id+'_800.jpg';
		return;
	} 
	if ((x <= 1024) && (y <= 768)) {
		document.body.background = '/backgrounds/'+id+'_1024.jpg';
		return;
	} 
	if ((x <= 1280) && (y <= 1024)) {
		document.body.background = '/backgrounds/'+id+'_1280.jpg';
		return;
	} 
	document.body.background = '/backgrounds/'+id+'_1600.jpg';
}

function openSite(URLStr)
{
    var maxx = screen.width;
    var maxy = screen.height;
    windowprops = "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width=100,height=100,left=100,top=100";
    window.open(URLStr+"&maxx="+maxx+"&maxy="+maxy,"",windowprops);
}
function openSiteScroll(URLStr)
{
    var maxx = screen.width;
    var maxy = screen.height;
    windowprops = "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=100,height=100,left=100,top=100";
    window.open(URLStr+"&maxx="+maxx+"&maxy="+maxy,"",windowprops);
}
function playvideo(URLStr)
{
    var maxx = screen.width;
    var maxy = screen.height;
	var w = 320;
	var h = 256;
	var x = Math.floor((maxx-w)/2);
	var y = Math.floor((maxy-h)/2);
    windowprops = "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width="+w+",height="+h+",left="+x+",top="+y+"";
    window.open("/site/playvideo.php?file="+URLStr,"",windowprops);
}

function playyoutube(URLStr)
{
    var maxx = screen.width;
    var maxy = screen.height;
	var w = 400;
	var h = 325;
	var x = Math.floor((maxx-w)/2);
	var y = Math.floor((maxy-h)/2);
    windowprops = "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width="+w+",height="+h+",left="+x+",top="+y+"";
    window.open("/site/playyoutube.php?code="+URLStr,"",windowprops);
}


function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_validateForm_en() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm_en.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@'); q=val.indexOf('.');
        if (p<1 || q<1 || p==(val.length-1) || q==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function MM_validateForm_nl() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm_nl.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@'); q=val.indexOf('.');
        if (p<1 || q<1 || p==(val.length-1) || q==(val.length-1)) errors+='- '+nm+' moet een geldig emailadres zijn.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is nog niet ingevuld.\n'; }
  } if (errors) alert('Het formulier is niet helemaal juist ingevuld:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function scrollUp(id) {
	x = document.getElementById(id).scrollTop;
	document.getElementById(id).scrollTop = x - 50;
}

function scrollDown(id) {
	x = document.getElementById(id).scrollTop;
	document.getElementById(id).scrollTop = x + 50;
}