<!--
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}


function HideContent(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
if(d.length < 1) { return; }
document.getElementById(d).style.display = "block";
}
function ReverseContentDisplay(d) {
if(d.length < 1) { return; }
if(document.getElementById(d).style.display == "none") { document.getElementById(d).style.display = "block"; }
else { document.getElementById(d).style.display = "none"; }
}


<!-- Naam in tekstveld--!>
function clearText(thefield) {
    if (thefield.defaultValue == thefield.value)
            thefield.value = ""
    else thefield.value = thefield.defaultValue
}


<!-- invulvelden menukaart alleen nummeric maken--!>

function Numeric() 
{ 
    if (event.keyCode >= 48 && event.keyCode <= 57){
        event.returnValue = true;
    }else{
        event.returnValue=false;
    }
} 

// function to only allow numeric key presses in a textbox
function numeric_only( e ){
	var unicode = e.charCode ? e.charCode : e.keyCode;
	// if the key is backspace, tab, or numeric
	if( unicode == 8 || unicode == 9 || ( unicode >= 48 && unicode <= 57 ) ){
		return true;
	}else{
		return false;
	}
}

function spring(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}