function showColourPanel(strSelectedOption)
{    

    // hide all elements
    
    changeObjectVisibility('divBoys', 'hidden', 'none');
    changeObjectVisibility('divGirls', 'hidden', 'none');
    changeObjectVisibility('divCustom', 'hidden', 'none');
    changeObjectVisibility('divSingle', 'hidden', 'none');    
     // show an element
     if (strSelectedOption != '')
     {
        changeObjectVisibility(strSelectedOption, 'visible', 'block');  
     }  

}