RE: Making a Field Mandatory in an Opportunity

var Bid= Xrm.Page.getAttribute("Bid").getValue();                  

if(Bid==1 && Bid==2)                                                                  

{

Xrm.Page.getAttribute("BondPayableTo").setRequiredLevel("required");

}

//Bid is your RadioButton name

//1=Bid Bond  and 2=Agreement to Bond