function formcheck()
{

	var error = "Sie haben in folgenden Feldern fehlerhafte Angaben gemacht:";
	var errorcode=0;
	if (document.forms[0].email_from_firstname.value.length==0)
	{
		error = error+"Vorname";
		errorcode++;
	}
	if (document.forms[0].email_from_name.value.length==0)
	{
		if (errorcode > 0 )
                                     error = error + ", ";
                                error = error+"Nachname";
		errorcode++;
	}
	var email = document.forms[0].email_from_mail.value;
	if (email.indexOf("@")<=0 || email.indexOf("@")!=email.lastIndexOf("@") || email.indexOf("@")>email.lastIndexOf(".")) 
	{	
		if (errorcode > 0 )
                                     error = error + ", ";
                                error = error+"Email";
		errorcode++;
	}
	if (errorcode>0)
	{
		alert (error);
		return false;
	}
	else return true;
}
function popup (doc,fenster)
{
	var win=window.open (doc,fenster,"width=535,height=450,screenX=10,screenY=10");	
	win.resizeTo(535,450);
	win.focus();
}
function preloadImages() 
{
	var i;
	if (document.images)
	{
		if (!document.myPics)
		{
			document.myPics = new Array();
			var myArguments = preloadImages.arguments;
			for (i=0; i < myArguments.length; i++)
			{
				document.myPics[i] = new Image();
				document.myPics[i].src = myArguments[i];
				//alert (myArguments[i]);
			} 
		}
	}
}