var radioStatus = new Array( );
 
function checkRadioState( obj )
{
if ( typeof radioStatus[ obj.id ] == 'undefined' ){
for ( x in radioStatus )
{
radioStatus[ x ] = false;
}
radioStatus[ obj.id ] = true;
}else{
if ( radioStatus[ obj.id ] == true ) {
obj.checked = false;
radioStatus[ obj.id ] = false;
}else{
for (x in radioStatus)
{
radioStatus[ x ] = false;
}
radioStatus[ obj.id ] = true;
}
}
}