// ----------------- toggleBlockText(...) -------------------
// Method to show or hide a paragraph or other block or span of text. 
// Use this version for text links to show/hide, and custom link text
// Parameters:
// hiddenDivId - the ID attribute of div to show or hide
// expander - pass in a reference to the image tag for the expender
//     usually this will just be "this" (without any quotes)
// expandText - the text to show when the block of text is hidden (to show the text) OPTIONAL
// collapseText - the text to show when the block of text is showing (to hide the text) OPTIONAL
// ----------------------------------------------------------
function toggleBlockText (hiddenDivId, expander, expandText, collapseText) {
    if (document.getElementById) {
        if (document.getElementById(hiddenDivId).style.display == "none") {
            document.getElementById(hiddenDivId).style.display = "";
						expander.innerHTML = collapseText?collapseText:defaultCollapseText;
        } else {
            document.getElementById(hiddenDivId).style.display = "none";
						expander.innerHTML = expandText?expandText:defaultExpandText;
        }  
    }
}