// correctly handle PNG transparency in Win IE 5.5 & 6.
function correctPNG() 
{
   var arVersion = navigator.appVersion.split("MSIE")
   var version = parseFloat(arVersion[1])
   if ((version >= 5.5) && (document.body.filters)) 
   {
      for(var i=0; i<document.images.length; i++)
      {
         var img = document.images[i]
         var imgName = img.src.toUpperCase()
         if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
         {
            var imgID = (img.id) ? "id='" + img.id + "' " : ""
            var imgClass = (img.className) ? "class='" + img.className + "' " : ""
            var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
            var imgStyle = "display:inline-block;" + img.style.cssText 
            if (img.align == "left") imgStyle = "float:left;" + imgStyle
            if (img.align == "right") imgStyle = "float:right;" + imgStyle
            if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
            var strNewHTML = "<span " + imgID + imgClass + imgTitle
            + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
            + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
            + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
            img.outerHTML = strNewHTML
            i = i-1
         }
      }
   }    
}

// Image Mouseover || mouseOver('testDiv','images/','plaatje','over')
function mouseOver(id,folder,img) 
{
	image = folder+img;
	document.getElementById(id).src = image;
	
	//uncomment for debugging in firebug
	//console.log(id);
	//console.log(folder);
	//console.log(img);
}

//ask to confirm before form submit
function confirm_entry_form(formname,message)
{
	input_box=confirm(message);
	if (input_box==true)
	{ 
		document[formname].submit() ;
	}
}

//ask to confirm before redirect to location
function confirm_entry_url(url,message)
{
	input_box=confirm(message);
	if (input_box==true)
	{ 
		location.href = url;
	}
}

function checkFields(form, field, action)
{
	forminputs = document[form].getElementsByTagName('input');
	for (i = 0; i < forminputs.length; i++)
	{
		if(forminputs[i].name.substr(0, field.length) == field)
		{
			forminputs[i].checked = action;
		}
	}
}

function showElem(elNaam) {
    // show or hide element (<div> for example)
	var obj = document.getElementById(elNaam);
	if (null != obj) {
		if (obj.style.display == "none" || obj.style.display == "") {
			obj.style.display = "block";
		}
		else {
  		  obj.style.display = "none";
		}
	}
}


function showElement(elNaam) {
    // show or hide element (<div> for example)
	var obj = document.getElementById(elNaam);
	if (null != obj) {
		if (obj.style.visibility == "hidden" || obj.style.visibility == "") {
			obj.style.visibility = "visible";
		}
		else {
  		  obj.style.visibility = "hidden";
		}
	}
}