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var mydivs=new Array('.main-panel','.main-panel2');

function opcl(arr, e){
    if ($(e).css('display') == 'none'){
        for(var i in arr){   
           $(arr[i]).hide();     
        }
        $(e).show();       
    }
}

<a href="#" class="view active" onclick="opcl(mydivs,'.main-catalog'); return false;"></a>