function NumberText(e)
{
    if(window.event)
    {
        if(e.keyCode<48   ||   e.keyCode>57||e.keyCode==8)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    else if(e.which)
    {
        if((e.which>47)   &&   (e.which<58)||(e.which==8))
        {
            return true;
        }
        else 
        {
            return false;
        }
    }
}