Concatenation In Javascript

I have a Function below

function see(sel,sel2)
{
      //alert(sel[sel.selectedIndex].text);
      alert(sel);
      alert(sel2);
      if (cell.selectedIndex > 0 )
      {      
            sel.originalcolor=sel.style.backgroundColor; sel.style.backgroundColor='#CCFFCC'
            sel2.originalcolor=sel2.style.backgroundColor; sel2.style.backgroundColor='#CCFFCC'
      }
      if (cell.selectedIndex == 0 )
      {      
            sel.originalcolor=sel.style.backgroundColor; sel.style.backgroundColor='#ECE9D8'
            sel2.originalcolor=sel2.style.backgroundColor; sel2.style.backgroundColor='#ECE9D8'

      }      
}

sel And sel2 are the id's of the table cell

I am calling this Function like this below

onchange="see('source','source2')"

How I make it To work To it accept source And source1 And use it instead of sel And sel2. I don't want to create more functions as I want to use one and pass different id's when calling the function