function initialize(firid,firvalue,secid,secvalue,thiid,thivalue) { addSel(firid,firvalue,a,b,c); addSel(secid,secvalue,a,b,c); addSel(thiid,thivalue,a,b,c); } function changefir(secid,thiid,upperid) { delSel(secid); addSel(secid,upperid,a,b,c); var i = secid[secid.selectedIndex].value; delSel(thiid); addSel(thiid,i,a,b,c); } function changesec(thiid,upperid) { delSel(thiid); addSel(thiid,upperid,a,b,c); } function delSel(id) { var len = id.length; for(i=0;i