var sElemspan = new Array("list_od","list_as","list_cer");

function showlnk(divIds){

	for(iCtr=0; iCtr<sElemspan.length; iCtr++){
		if((divIds==sElemspan[iCtr])&&(document.getElementById(divIds).style.display=="none")){
			document.getElementById(sElemspan[iCtr]).style.display="block";
		} else {

			document.getElementById(sElemspan[iCtr]).style.display="none";

		}
	}
}