void employee.showPayHikeForm(Employee employees)

{

querystring = "";

for each  employee in employees

{

querystring = querystring + "empid=" + employee.ID + "&";

}

openUrl("#Form:Salary_HikeForm?" + querystring,"popup window","height=400,width=400");

}

I noticed several problems with it as its is setup, I have a similar app that i want to implement this type of bulk edit on mine i just want to learn the process before touching mine

if you select on the main report more than 1 record trows an error "empid" canot be used atmost 1 time

i did a log on the empid and im getting a null value wich meand i cant retrive ani nfo nor modify its values 

can anyone please explain how exactly the ?, &, work? or a guide on openurl with a list of available paramaters and features

thanks in advance