// JavaScript Document
var intLastId = '0'
function doClick(intType) {
    var i, srcElement, targetElement;
    srcElement = window.event.srcElement;
    if (intType == 1) i = srcElement.id;
    if (intType == 2) i = srcElement.id.substring(7);
    if (intLastId !='0' && intLastId != i && !(intLastId.charAt(0) == i.charAt(0)) ) {
        document.all(intLastId).src = "images/sytb.png";
        document.all("subject" + intLastId + "_message").style.display = "none";
    }
    intLastId = i;

    targetElement = document.all("subject" + i + "_message");
    if (targetElement.style.display == "none") {
        document.all(i).src = "images/sytb.png";
        targetElement.style.display = "";    
    } 
    else {
        document.all(i).src = "images/sytb.png";
        targetElement.style.display = "none";
    }
}