How to make parameter optional? - Urgent please

[bandarna]

Hi,
I have 5 parameters (all are allow range).
Right now report is running fine, but I pass all 5 parameter values.( All parameters are mandatory)
How can I make them make them optional?


See the code below:
{coa_elem_desc.element_id} = {?P_Element_1} or
{coa_elem_desc_1.element_id} = {?P_Element_2} or
{coa_elem_desc_2.element_id} = {?P_Element_3} or
{coa_elem_desc_3.element_id} = {?P_Element_4}

Example: I can enter P_Element_1 values as 1100 to 1103
and P_Element_2 values as 2100 to 2200
and P_Element_3 Values as null to null
and P_Element_4 values as null to null

Report should run for a given parameters. can anyone help me?

Thanks
nb