function mover(mythis){
 mythis.className = 'rrowIE'
 if(mythis.id.substr(0,5)=='boven'){
	document.getElementById(mythis.id.replace('boven','onder')).className='rrowIE';
 }else{
	document.getElementById(mythis.id.replace('onder','boven')).className='rrowIE';
 }
}

function mout(mythis){
 mythis.className = 'rrow'
 if(mythis.id.substr(0,5)=='boven'){
	document.getElementById(mythis.id.replace('boven','onder')).className='rrow';
 }else{
	document.getElementById(mythis.id.replace('onder','boven')).className='rrow';
 }
}
var isIE = (navigator.appName.indexOf('Microsoft')   != -1);
function myopen(link,w,h) 
{
	mymut = window.open(link,'Afbeelding','width='+w+',height='+h+',menubar=no,toolbars=no,scrollbars=no');
}

function numonly(el){
	if(el.value!=''){
		tmp=parseInt(el.value);
		if(tmp.toString()!="NaN") {el.value=tmp;}
		else {el.value='';}
	}
}