function clearField(id,str) {
	if(id.value == str) {
		id.value = "";
	}
}

function fillField(id,str) {
	if(id.value == "") {
		id.value = str;
	}
}

function checkField(id,str) {
	if(document.getElementById(id).value == str) {
		document.getElementById(id).value = "";
		document.getElementById(id).focus();
		return false;
	} else {
		return true;
	}
}

function openCatalogus(val){
	valArray = val.split(' ');
	for(i=0;i<5;i++){
		if(typeof valArray[i]=='undefined') valArray[i] = '';
	}
	//window.open('http://cat.markiezaatsbibliotheken.nl/cgi/Woorden.cgi?TAAL=N&MAX=20&METHODE=1&ZOEKIN=B&WOORD1='+valArray[0]+'&WOORD2='+valArray[1]+'&WOORD3='+valArray[2]+'&WOORD4='+valArray[3]+'&WOORD5='+valArray[4]+'&LINK=E','catalogus','width=500,height=400,scrollbars=yes,toolbar=yes');
    window.open('http://195.18.116.238/webopac/Vubis.csp','catalogus','width=500,height=400,scrollbars=yes,toolbar=yes');
}

function openWindow(url){
	window.open(url,'catalogus','width=500,height=400,scrollbars=yes,toolbar=yes');
}