// show or hide element (<div> for example)
function showElem(elNaam) {
	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";
		}
	}
}

// show element and hide other (<div> for example)
function switchElem(elShow, elHide) {
	var obj = document.getElementById(elShow);
	var hide = document.getElementById(elHide);
	if (null != obj) {
		if (obj.style.display == "none" || obj.style.display == "") {
			obj.style.display = "block";
		}
		else {
  		  obj.style.display = "none";
		}
	}
	if (null != hide)
		hide.style.display = "none";
}

// multiple selection dropdown
function updateValue(form, fields, field, length) {
	var value 	= '';	
	var add	  	= '';
	// form input fields
	forminputs = document[form].getElementsByTagName('input');
	for (i = 0; i < forminputs.length; i++) {
		if(forminputs[i].name.substr(0, fields.length) == fields && forminputs[i].checked) {			
			if (value)
				value = value + ', ';
			add 		= forminputs[i].id.replace(field + '-', '');
			value 	= value + add.replace('_', ' ');
		}
	}
	// edit value
	if (value && value.length > length) {
		value = value.substr(0, length);
		if (value.substr(-1) == ',')
			value += ' ';
		value = value + '...';
	}
	document.getElementById(field).innerHTML = value;
}

// 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 && version < 7) && (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
         }
      }
   }    
}