function doRange(arg, min, max) { 
    var Field = arg ; 
    var val = parseInt(Field.value, 10); 
    if ((val < min) || (val > max)) { 
        msg = "Value entered (" + val + ") is not within the valid range of " + min + " to " + max + "."; 			        		
        alert(msg); 
        Field.focus();         
        return false; 
    } 
    return true ; 
}