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Код

    var lastClicked = null;
    function chkClick(e) {
        if (!e) e = window.event;
        var sender = (e.target) ? e.target : e.srcElement;
        if (lastClicked && e.shiftKey) {
            var chks = document.getElementsByName("selected_posts[]");
            var firstChk = Math.min(parseInt(lastClicked.value), parseInt(sender.value));
            var lastChk = Math.max(parseInt(lastClicked.value), parseInt(sender.value));
            var curChk;
            for (var i = 0; i < chks.length; i++) {
                curChk = parseInt(chks[i].value);
                if ((curChk >= firstChk) && (curChk <= lastChk))
                    chks[i].checked = true;
            }
        } else {
            lastClicked = sender;
        }
    }
    window.onload = function() {
        var chks = document.getElementsByName("selected_posts[]");
        for (var i = 0; i < chks.length; i++) {
            if (chks[i].addEventListener) {
                chks[i].addEventListener("click", chkClick, false);
            } else {
                chks[i].attachEvent("onclick", chkClick);
            }
        }
    }