function clickAlgemen(){
	var alg_check = document.getElementById("alg_voorwaarden").checked;
	document.contact_form.button.disabled=!alg_check;

}
function clickCheck(chkbut,volbut){
	var alg_check = document.getElementById(chkbut).checked;
	document.contact_form.button.disabled=!alg_check;
}
function oproepstandaard(){
	var alg_check = document.getElementById("standaard_chk").checked;
	document.getElementById("date-sel1-dd").disabled=alg_check;
	document.getElementById("date-sel1-mm").disabled=alg_check;
	document.getElementById("date-sel1").disabled=alg_check;
	
	document.getElementById("date-sel2-dd").disabled=alg_check;
	document.getElementById("date-sel2-mm").disabled=alg_check;
	document.getElementById("date-sel2").disabled=alg_check;

}
function del_Lokatie(id,url,text){

	var where_to = confirm(text);

	if (where_to== true){
	   window.location=url;
	}
}
function open_close(id){
	var viz = document.getElementById(id).style.visibility;
	if(viz == "visible"){
		document.getElementById(id).style.visibility = 'hidden';
		document.getElementById(id).style.height = 0+'px';
	}else{
		document.getElementById(id).style.visibility = 'visible';
		document.getElementById(id).style.height = 100+'%';
	}

}

function getOptionValue(obj,fname)
{
var index0;
	if (true)
	{
		
			index0 = document.getElementById(fname)[document.getElementById(fname).selectedIndex].value;		
	
		if(index0==10){
			document.getElementById('sub_b').style.visibility = 'visible';
			document.getElementById('sub_b').style.height = 'auto';
			
		}else{
			document.getElementById('sub_b').style.visibility = 'hidden';
			document.getElementById('sub_b').style.height = 0+'px';
		}
	}
}