/*
	Java scripts
	Managementboek.com
*/

function controleerZoekopdracht(field) {
	var minLengte = 4;
	
	if (field.value.length < minLengte) {
		alert('Vul een trefwoord in van tenminste '+minLengte+' tekens lang.');
		field.focus();
		return false;
	}
	
	return true;
}

function highlight(el) {
	el.className = "w3portalsubmenuitemhighlight";
	return true;
}

function unhighlight(el) {
	el.className = "w3portalsubmenuitem";
	return true;
}

function openCenteredWindow(url, name, width, height, options) {
	
	var left = (screen.width - width)   / 2;
	var top  = (screen.height - height) / 2;
    
	if (options) {
		options = ','+options;
	}
	
	var cw = window.open(url, name, 'width='+width+',height='+height+',left='+left+',top='+top+options);	
	
	cw.focus();
}