function valid(){
	if(document.getElementById('herr').checked==false && document.getElementById('frau').checked==false){
		alert(lang_AlertAnrede);
     	return false;
	}
	
	if(document.getElementById('vorname').value == ""){
		alert(lang_AlertVorname);
      	return false;
	}
	
	if(document.getElementById('name').value == ""){
		alert(lang_AlertName);
      	return false;
	}
	
	if(document.getElementById('plz').value == ""){
		alert(lang_AlertPLZ);
      	return false;
	}
			
	if(document.getElementById('Freund').checked==false && document.getElementById('Foerderer').checked==false && document.getElementById('Maenzen').checked==false){
		alert(lang_AlertMitgliedschaft);
     	return false;
	} 
	
	if(document.getElementById('mitgliedsbeitrag').value == ""){
		alert(lang_AlertMitgliedsbeitrag);
      	return false;
	}	
	
	if(document.getElementById('email').value == ""){
		alert(lang_AlertEmail1);
      	return false;
	}	
		var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
		var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$");
		vormals =document.getElementById('email').value;
		vormals=document.getElementById('email').value=vormals.replace(/;/g,',');
		vormals=document.getElementById('email').value=vormals.replace(/ /g,'');
		vormals =document.getElementById('email').value+','+vormals;
		jetzt ='"'+vormals.replace(/,/g,'","')+'"';
		emails = eval('new Array('+jetzt+')');
		for (i=0; i < emails.length; ++i){
			if ((r1.test(emails[i])==false && r2.test(emails[i]) == false)|| emails[i].indexOf("@") < 2){
				alert ('\"'+emails[i]+'\"\n'+lang_AlertEmail2)
				return false;
				break;
			}
		}
}


function pngfix () {
	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
		  }
	   }
	}
}