Set Visibility Openlayers

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If the name of my layer in openlayers is "olayer". And if i want to set its visibility to true. Then the simple code is

olayer.setVisibility(true); But if i want to set the visibility by storing the layer's name in a different variable like this:

var vari="olayer"; vari.setVisibility(true); This won't work because its taking "vari" as the name of the layer instead of the string stored in variable "vari". Plz help



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