text area editing

[confusecon]

HI to all I am new be and not able to resolve the issue when i tries to edit text area everything works fine for crome and ie but does not work for firefox
in fire fox when i try to edit intially everythings works fine but if i click other feild in form and after that try to edit text area backspace key stuck up and does not work please help me ?? code which i am using is menitoned below

function stopPropagation(e)
{
e = e||event; /* get IE event ( not passed ) */
e.stopPropagation? e.stopPropagation() : e.cancelBubble = true;

}


function checkShortcut(e)
{
stopPropagation(e);
if({8:1,13:1}[e.keycode||e.which])
{
if( x )
return true;
return false;
}
}