function checkemail(f){
	var str=f.email.value
	var filter=/^(\w+(?:\.\w+)*)@((?:\w+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str))
	testresults=true
else{
	alert("El e-mail no es correcto!")
	testresults=false
	}
return testresults
}