the code below does not work in IE8:

$('#centro #linha1 #coluna2').load("index.php/"+_page, {}, function(){ alert('teste'); });

but this code works in all browsers:

$('#coluna2',$('#linha1',$('#centro'))).load("index.php/"+_page, {}, function(){ alert('teste'); });

I concluded that the selectors are the problem, see the tests:

alert($('#centro>#linha1>#coluna2').size()); IE8 return 0; FIREFOX,OPERA return 1;

alert($('#centro > #linha1 > #coluna2').size()); IE8 return 0; FIREFOX,OPERA return 1;

alert($('#centro #linha1 #coluna2').size()); IE8 return 0; FIREFOX,OPERA return 1;

but this works:

alert($('#coluna2',$('#linha1',$('#centro'))).size()); IE8 return 1; FIREFOX,OPERA return 1;