var AGN_UserAgent = navigator.userAgent.toLowerCase();
var AGN_Opera = (AGN_UserAgent.indexOf('opera') != -1); // is opera
var AGN_Opera8 = ((AGN_UserAgent.indexOf('opera 8') != -1 || AGN_UserAgent.indexOf('opera/8') != -1) ? 1 : 0); // is opera8
var AGN_NS4 = (document.layers) ? true : false; // is netscape 4
var AGN_IE4 = (document.all && !document.getElementById) ? true : false; // is IE 4
var AGN_IE5 = (document.all && document.getElementById) ? true : false; // is IE 5+
var AGN_NS6 = (!document.all && document.getElementById) ? true : false; // is netscape 6
var AGN_FireFox = (AGN_UserAgent.indexOf("firefox/") != -1); // is firefox
var AGN_Transitions = (AGN_IE5 || AGN_IE4) ? true : false // do we support transitions			

function FindControl(strControlName) 
{
    var objReturn = '';
        if (AGN_IE5 || AGN_NS6 || AGN_Opera || AGN_Opera8)
        {
            objReturn = document.getElementById(strControlName);
        }
        else if (AGN_IE4)
        {
            objReturn = document.all[strControlName];
        }
        else if (AGN_NS4)
        {
            objReturn = document.layers[strControlName];
        }
    return objReturn
}

function IsNumeric(sText,bWhole)
{
   var ValidChars = "0123456789.";
   if ( bWhole ) 
   {
    ValidChars = "0123456789";
   }
    
   var IsNumber=true;
   var Char;
   
   for (i = 0; i < sText.length && IsNumber == true; i++) 
   { 
        Char = sText.charAt(i); 
        if (ValidChars.indexOf(Char) == -1) 
        {
            IsNumber = false;
        }
   }
   return IsNumber;
}
function SwitchImage( sImage ) 
{
	var imgBig = FindControl('foto_big');
	imgBig.src = "write/uitvoering_" + sImage;
	current_image = sImage;
}

function BigImage()
{
	var divEnlarge = FindControl('imgEnlarge');
	var divMask = FindControl('divMask');
	var selKleur = FindControl('selKleur');
	var selMaat = FindControl('selMaat');
	selKleur.style.visibility = "hidden";
	selMaat.style.visibility = "hidden";
	
	divMask.style.visibility = "visible";
	divMask.innerHTML = "<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />";
	divEnlarge.style.visibility = "visible";
	divEnlarge.innerHTML = '<a href=\"javascript:CloseImage()\">Sluit dit venster&nbsp;</a><br><a href=\"javascript:CloseImage()\"><img src=\"write/' + current_image + '\" border=\"0\" style=\"-moz-opacity:1.00; filter:Alpha(opacity=100, finishopacity=100, style=1)\"></a>';
}

function CloseImage( sImage )
{
	var divEnlarge = FindControl('imgEnlarge');
	var divMask = FindControl('divMask');
	var selKleur = FindControl('selKleur');
	var selMaat = FindControl('selMaat');
	selKleur.style.visibility = "visible";
	selMaat.style.visibility = "visible";
										
	divMask.style.visibility = "hidden";
	divMask.innerHTML = "";
	divEnlarge.style.visibility = "hidden";						
	divEnlarge.innerHTML = "";
}