function checkMail()
{
	var x = document.forms[0].email.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(x)) alert('Please insert a valid email address');
}
function OpenPDF(file) { window.open(file,'_blank','width=700,height=500,top=0,left=0,toolbar=0,location=0,directories=0,menuBar=0,scrollbars=1,resizable=1') }
function mail_ok()
{
var a,i,j,k,arobase;
i=0;
k=0;
a = document.newsletter.email.value;  
for (j=0; j<a.length-1;j++)
{
	if (a.charAt(j)=="@")
	{	i++; arobase=i; }
}
for (j=arobase; j<a.length-1;j++)
{
	if (a.charAt(j)==".")
		k++;
} 
if (i!=1 || k<1)
{
	alert("Please enter a valid email address!");
	return false;
}
}