function objRef(id) {if (document.getElementById(id)) return document.getElementById(id)}
function styleRef(id) {return this.objRef(id).style}

function hl(obj){
	b=obj.src;
	s=(b.substring(b.length-4,b.length-5)==0)?'1':'0';
	obj.src=(b.substring(b.length-5,0)+s+b.substring(b.length,b.length-4));
}

function pulldown(nr) {
	styleRef('pulldown'+nr).display='block'
}

function hlPijl(id,kleur) {
	objRef(id).src='grafisch/pijl_r_'+kleur+'.gif'
}

function hlRegel(titel,id,kleur) {
	styleRef(titel+id).color='#'+kleur
	hlPijl('pijl'+titel+id,'k'+kleur)
}


// *** BEGIN PULLDOWN JAVASCRIPT ***
var menutimeout;

function menuaan(id) {
	if (menutimeout) clearTimeout(menutimeout);
	for (i=1;i<=20;i++) if (objRef('pulldown'+i)) styleRef('pulldown'+i).display=(i==id)?'block':'none';
}

function menuuit(id){
	if (objRef('pulldown'+id)) styleRef('pulldown'+id).display='none';
}

function menu(id,s) {
	nr=id
	switch (s) {
		case 0: { menutimeout = setTimeout("menuuit(nr);", 1500); break }
		case 1: { if (menutimeout) clearTimeout(menutimeout); break }
	}
}
// *** EINDE PULLDOWN JAVASCRIPT ***