Behavior.renderHead stopped working after migration from 1.4 to 6.5

[Artur]

Hi Guys,

We just migrated our code to W6.5 and are very happy about it.
Unfortunately we don't know how to fix one of the errors.
We did a research but cannot find a solution :(

The code adds a link before a component with some javascript:

            private class ChangeDateBehavior extends Behavior {
  [...]
                @Override
                public void renderHead(Component component, 
IHeaderResponse response) {
                    if 
(RequestCycle.get().find(AjaxRequestTarget.class) != null) {
                        String javascript = "var e = Wicket.$('" + 
getMarkupId()
                                + "'); if (e != null && 
typeof(e.parentNode) != 'undefined') e.parentNode.removeChild(e);";
response.render(JavaScriptHeaderItem.forScript(javascript, null));
                    }
                    String tag = "<a id=\"" + getMarkupId() + 
"\"href=\"#\" onclick=\"changeDate('" + component.getMarkupId()
                        + "', " + Integer.toString(days) + ")\">" + txt 
+ "";
response.render(JavaScriptHeaderItem.forScript(tag, null));

                }

                @Override
                public void bind(Component component) {
                    this.component = component;
                }

                public String getMarkupId() {
                    return component.getMarkupId() + "--" + id;
                }

            }


And the error msg from the console:
ERROR: Wicket.Head.Contributor.processScript: SyntaxError: syntax error: 
eval -> <a id="from2059--lt"href="#" onclick="changeDate('from2059', 
-1)"><<\/a>


Thanks for help in advance,
Artur

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