Specify range in ValuesIcons

[kishore_snist]

i would like to show an icon based on a value Range for a listgrid field .All i could find is this way
fields : [
{ name:"status",
valueIcons: {
Normal : "greenIcon.png",
Slow : "yellowIcon.png",
Offline : "redIcon.png"
}
},
... other fields ...
]

but i would like to specify a range in the valueIcons Map for example

fields : [
{ name:"population",
valueIcons: {
'< = 100' : "greenIcon.png",
'< =1000' : "yellowIcon.png",
'>1000': "redIcon.png"
}
},
... other fields ...
]
Any Suggestions Please.

At present i am using SmartClient 8.3p