ribbon save and save new buttons are disable on phonecall activity.

hi everyone,

i try to get a value from contact to phonecall but when i open the phonecall i cant add email(there is 1:N relationship between phonecall) activity.the ribbon save and save new buttons are disable.

function onload()
{

var x=window.top.opener.parent.Xrm.Page.getAttribute("new_adono").getValue()
Xrm.Page.getAttribute("new_adono").setValue(x);

}

Crm Software Specialist