function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
   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
         }
      }
   }    
}

function rollOver(img_id,img_src)
{
    var image = window.document.getElementById(img_id);
	image.src = img_src;
}

function checkEmail(email) 
{
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email.value)) 
	{
		alert('Please provide a valid ' + email.name + '!');
		email.select();
		return false;
	}
	return true;
}

function checkField(field) 
{	
	if (field.value.length <= 0) 
	{
		alert('Please provide a valid ' + field.name + '!');
		field.select();
		return false;
	}
	return true;
}

function checkForm(formName) 
{
	// Retrieve form
	var form = document.forms[formName];
	
	// Check name
	if (!checkField(form.name))
	{
		return false;
	}
	// Check email
	else if (!checkEmail(form.email))
	{
		return false;
	}
	// Check message
	else if (!checkField(form.message))
	{
		return false;
	}
	
	// Otherwise
	return true;
}

function submitForm(formName) 
{
	// Check form status
	var status = checkForm(formName);
	
	// If status is ok (true), then submit form
	if (status)
	{
		document.forms[formName].submit();
	}
}