Can I pass parameters to a checkbox field in embedded Form in HTML pages?

Can I pass parameters to a checkbox field in embedded Form in HTML pages?

I want to pass parameters to a embedded form inside a HTML page. I know it is possible using the params attribute like this:

<div elName='zc-component' formLinkName='MyForm' params='Number_Field=<%=var_number_value%>'>

I want to do the same with a checkbox field, but I'm not being successfull.

I works like a charm If I access the form directly passing parameters to a checkbox field through the URL:

openUrl("#Form:MyForm?Checkbox_Field=value1%2Cvalue2%2Cspaced%20value", "same window");

But it doesn't work in a form embedded in a HTML page... 

Can anyone help me?