function removeFieldRow(node) {

    // XXX replace with getParentElement
    row = node.parentNode.parentNode;
    row.parentNode.removeChild(row);

    return;
}

function getInputOrSelect(node) {

	inputs = node.getElementsByTagName("input");
	if(inputs.length > 0) {
		return inputs[0];
	}
	
	selects = node.getElementsByTagName("select");
	if(selects.length > 0) {
		return selects[0];
	}

	return null;
}


/**
 * Handles keypress in table cell inputs
 *
 * If something is entered to the last table row,
 * then append a new row
 *
 */
function handleKeyPress (e) {
    /* Dispatcher for handling the last row */
    
    // Ignore tabs so we can move out from DataGridWidget   
    // or otherwise tab keeps adding new rows in FireFox 
    // Also, don't try to mess with Enter
    if(e.keyCode == 9 || e.keyCode == 13) {
    	return;
    }
    
    // XXX: Generalize window.event for windows
    // Grab current node, replicate, remove listener, append
    var currnode = window.event ? window.event.srcElement : e.currentTarget;
    /* 
       XXX Should add/remove event listeners via JS, but IE has
       non-standard methods.  Not hard, but for now, just check 
       if we are the last row.  If not, bail.
    */
    
    var tbody = getParentElement(currnode, "TBODY");
    var tr = getParentElement(currnode, "TR");
    var rows = tbody.getElementsByTagName("TR");
    
    if (rows.length == (tr.rowIndex)) {
		// Add all the last row specific stuff here
		var newtr = tr.cloneNode(true);
		tr.parentNode.appendChild(newtr);
			
		// Turn on hidden "delete" image for current node
		var img = tr.getElementsByTagName("img")[0];
		img.style.display = "inline";
												
		var cells = tr.getElementsByTagName("td");
		
		// note that last cell is reserved for buttons
		var lastInput = getInputOrSelect(cells[cells.length-2]);
		if(lastInput == null) {
			alert("There is a bug in datagridwidget.js script");
			return;
		}
		
		// Start re-creating tab indexes from the last available
		// tabindex in the table inputs
		var baseTabIndex = parseInt(lastInput.getAttribute("tabindex"));
		
		cells = newtr.getElementsByTagName("td");
		
		// Update tabindexes + clear contents 
		for(var i=0; i<cells.length; i++) {
			
			td = cells[i];
			
			input = getInputOrSelect(td);
			if(input == null) continue;
					
			baseTabIndex++;												
										
			input.setAttribute("tabindex", baseTabIndex.toString());
			
			// clear contents for the new row
			input.setAttribute("value", "");
		}
					
    } else {
		// Handle all other keypress entries, like cursor keys
    }

    return;
}


function getParentElement(currnode, tagname) {
    /* Recursive function to move up the tree to a certain parent */

    tagname = tagname.toUpperCase();
    var parent = currnode.parentNode;

    while (parent.tagName.toUpperCase() != tagname) {
	parent = parent.parentNode;
	// Next line is a safety belt
	if (parent.tagName.toUpperCase == "BODY") return null;
    }

    return parent;
}


function moveRowDown(node){
    row = getParentElement(node, "TR")
    nextRow = row.nextSibling
    var tbody = getParentElement(node, "TBODY");
    var rows = tbody.getElementsByTagName("TR");
    if (nextRow && (rows.length != (nextRow.rowIndex))){
        shiftRow(nextRow, row)
    }
}
function moveRowUp(node){
    row = getParentElement(node, "TR")
    previousRow = row.previousSibling
    if (previousRow){
    shiftRow(row, previousRow)
    }
}

function shiftRow(bottom, top){
    bottom.parentNode.insertBefore(bottom, top )   
}