function HideContent(d) {
	document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
	document.getElementById(d).style.display = "block";
}
function ReverseDisplay(d) {
	if(document.getElementById(d).style.display == "none") { document.getElementById(d).style.display = "block"; }
	else { document.getElementById(d).style.display = "none"; }
}
function updateHour(field) {
	waarde = field.value;
	newvalue = "" + waarde;
	
	newvalue = newvalue.replace(".", "h");
	newvalue = newvalue.replace("u", "h");
	
	if (newvalue.length == 1) {
		newvalue = "0" + newvalue + "h00";
	}else if (newvalue.length == 2) {
		if (newvalue.indexOf("h") == -1) {
			newvalue = newvalue + "h00";
		}else{
			newvalue = "0" + newvalue + "00";
		}
	}else if (newvalue.length == 3) {
		if (newvalue.indexOf("h") == -1) {
			newvalue = newvalue.substr(0,2) + "h" + newvalue.substr(2,4);
		}else{
			newvalue = newvalue + "00";
		}
	}else if (newvalue.length == 4) {
		if (newvalue.indexOf("h") == -1) {
			newvalue = newvalue.substr(0,2) + "h" + newvalue.substr(2,4);
		}else if (newvalue.indexOf("h") <= 2) {
			newvalue = "0" + newvalue.substr(0,1) + "h" + newvalue.substr(2,4);
		}else{
			newvalue = newvalue.substr(0,1) + "h" + newvalue.substr(2,4) + "0";
		}
	}else{
		newvalue = "" + waarde;

	}
	
	// checken of het numeriek is
	field.value = newvalue;
}