【www.gdgbn.com--Action】

function setPointer(theRow, theAction)
{
    var theCells = null;
    var theDefaultColor = "#ffffff", thePointerColor = "#D5DFF4", theMarkColor = "#EAF3E9";

    // 1. Pointer and mark feature are disabled or the browser can"t get the
    //    row -> exits
    if ((thePointerColor == "" && theMarkColor == "")
        || typeof(theRow.style) == "undefined") {
        return false;
    }

    // 2. Gets the current row and exits if the browser can"t get it
    if (typeof(document.getElementsByTagName) != "undefined") {
        theCells = theRow.getElementsByTagName("td");
    }
    else if (typeof(theRow.cells) != "undefined") {
        theCells = theRow.cells;
    }
    else {
        return false;
    }

    // 3. Gets the current color...
    var rowCellsCnt  = theCells.length;
    var domDetect    = null;
    var currentColor = null;
    var newColor     = null;
    // 3.1 ... with DOM compatible browsers except Opera that does not return
    //         valid values with "getAttribute"
  if (typeof(window.opera) == "undefined"
        && typeof(theCells[0].getAttribute) != "undefined") {
        currentColor = theCells[0].getAttribute("bgcolor");
        domDetect    = true;
    }
    // 3.2 ... with other browsers
    else {
        currentColor = theCells[0].style.backgroundColor;
        domDetect    = false;
    } // end 3

    // 4. Defines the new color
    // 4.1 Current color is the default one
    if (currentColor == ""
        || currentColor.toLowerCase() == theDefaultColor.toLowerCase()) {
        if (theAction == "over" && thePointerColor != "") {
            newColor = thePointerColor;
        }
        else if (theAction == "click" && theMarkColor != "") {
            newColor = theMarkColor;
        }
    }
    // 4.1.2 Current color is the pointer one
    else if (currentColor.toLowerCase() == thePointerColor.toLowerCase()) {
        if (theAction == "out") {
            newColor = theDefaultColor;
        }
        else if (theAction == "click" && theMarkColor != "") {
            newColor = theMarkColor;
        }
    }
    // 4.1.3 Current color is the marker one
    else if (currentColor.toLowerCase() == theMarkColor.toLowerCase()) {
        if (theAction == "click") {
            newColor = (thePointerColor != "")
                     ? thePointerColor
                     : theDefaultColor;
        }
    } // end 4

    // 5. Sets the new color...
    if (newColor) {
        var c = null;
        // 5.1 ... with DOM compatible browsers except Opera
        if (domDetect) {
            for (c = 0; c < rowCellsCnt; c++) {
                theCells[c].setAttribute("bgcolor", newColor, 0);
            } // end for
        }
        // 5.2 ... with other browsers
        else {
            for (c = 0; c < rowCellsCnt; c++) {
                theCells[c].style.backgroundColor = newColor;
            }
        }
    } // end 5

    return true;
}

本文来源：http://www.gdgbn.com/flash/20681/