function readonlygray(){
    var cells = $$("input"); 
    for (var i = 0; i < cells.length; i++) {  
        if ( cells[i].readAttribute('readonly')=="readonly") { 
            // grab the data 
            cells[i].className='disabled';
        }
    }
    var cells = $$("select"); 
    for (var i = 0; i < cells.length; i++) {  
        if ( cells[i].readAttribute('disabled')=="disabled") { 
            // grab the data 
            cells[i].className='disabled';
        }
    }
    var cells = $$("textarea"); 
    for (var i = 0; i < cells.length; i++) {  
        if ( cells[i].readAttribute('readonly')=="readonly") { 
            // grab the data 
            cells[i].className='disabled';
        }
    }
}
window.onload=readonlygray;