CRM 2011-javascript to make another field empty between two fields

function MakeEmpty(field1,field2)

{

var firstfield=Xrm.Page.data.entity.attributes.get(field1);

if(firstfield!=null)

{

var firstfieldvalue=firstfield.getValue();

if(firstfieldvalue!=null)

{

var secondfield=Xrm.Page.data.entity.attributes.get(field2);

if(secondfield!=null)

{

var secondfieldvalue=secondfield.setValue(null);

}

}

}

}

Note : call this method onchange event of  the two fields but  pass the field names as comma separated parameter
Field1-Current Field
Field2-Field to be empty