Same sender and receiever

function SameRecAndSen()

{

var lookup1 = new Array();

lookup1 = Xrm.Page.getAttribute("from").getValue();

 if (lookup1 != null) {

   var name = lookup1[0].name;

   var id1 = lookup1[0].id;

   var entityType = lookup1[0].entityType;

 }

var lookup2 = new Array();

lookup2 = Xrm.Page.getAttribute("to").getValue();

 if (lookup2 != null) {

   var name = lookup2[0].name;

   var id2 = lookup2[0].id;

   var entityType = lookup2[0].entityType;

 }

for(var i=0;i<lookup2.length;i++)

{

if(id1==lookup2[i].id)

 {

alert("you can't");

 Xrm.Page.getAttribute("to").setValue(null);

 }

}

}