function checkform()
{
	for (i=0;i<4;i++)     //checks for valid form entries
	{
		box = document.register.elements[i];
		if (!box.value)
		{
			alert('You haven\'t filled in ' + box.name + '!');
			box.focus()
			return false;
		}
	}
    if (i=4)    //skips apt nbr.
        {i++;
    }
    for (i=5;i<7;i++)
    {
    	box = document.register.elements[i];
    	if (!box.value)
    	{
    		alert('You haven\'t filled in ' + box.name + '!');
    		box.focus()
    		return false;
    	}
    }
    var x = document.register.email.value;
    var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    if (!filter.test(x))
    {
        alert('Incorrect email address');
         document.register.email.focus()
         return false;
    }

    return true;
}