JavaScript Last day of Previous month

I am very new to Javascript and Hyperion Interactive reporting.

I need to display last day of the previous month in my text box as default when the form loads. The following code is for displaying sysdate.

Thanks!

var the_date = new Date()
the_mon = (the_date.getMonth() + 1)+""
if(the_mon.length <2)
{
the_mon = '0'+the_mon
}
the_dt = the_date.getDate()+""
if(the_dt.length <2)
{
the_dt = '0'+the_dt
}
ActiveDocument.Sections["Dashboard"].Shapes["TextBox1"].Text = (the_mon) + "/" + the_dt + "/" + the_date.getFullYear()

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