function checkmailchr(field)
        {
                var chars='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@.'
                var temp

                for (var i=0;i<field.value.length;i++)
                {
                        temp=field.value.substring(i,i+1)
                        if (chars.indexOf(temp,0)==-1)
                        {
                                field.select()
                                return false
                        }
                }
        }
	
	function isValidEmail(field)
        {
                if ((field.value.indexOf('@') != -1 ) && (field.value.indexOf('.') != -1))
                {
                        var symchars1 = '@'
                        var symchars2 = '.'
                        var tempcount1 = 0
                        var tempcount2 = 0

                        for (var i=0;i<field.value.length;i++)
                        {
                                if (symchars1 == field.value.substring(i,i+1))
                                {
                                        tempcount1 = i;
                                }
                                if (symchars2 == field.value.substring(i,i+1))
                                {
                                        tempcount2 = i;
                                }
                        }

                        if (tempcount1 > tempcount2)
                        {
                                field.select()
                                return false;
                        }
                }
                else
                {
                        alert('E-mail is required !!');
						field.select()
                        return false;
                }
                if (checkmailchr(field) == false)
                {
                        alert('E-mail is required !!');
						field.select()
                        return false;
                }
				document.newsletter.submit();
                return true;
        }