function swap_image(myImageLink, myLargeImage, myImageID, myImageUrl, myDesc){
    var img = document.getElementById(myImageID);
    img.src = myImageUrl;
    img.alt = myDesc;
    var lnk = document.getElementById(myImageLink)
    lnk.href = myLargeImage
}

function clearbox(box) {
 if(box.value==box.defaultValue) {
   box.value = "";
  }
 }

function clear_checkboxes (myID){
    var frm = document.forms[0];
    for (i=0; i<frm.length; i++){
        if (frm.elements[i].id != myID){
            if (frm.elements[i].id.indexOf ('cb') != -1){
			    frm.elements[i].checked = false;
		    }
        }				
    }
}