//Function for selecting all the values listed in the index page of the admin page.
function check_all(frm, checkboxname, chkname)
{
	chkbname=checkboxname.name;

	element_len = frm.elements.length;
	if(checkboxname.checked==true )
	{
		for (i=0; i<element_len; i++)
		{
			this_element = frm.elements[i]; 
			if (this_element.type == 'checkbox' && this_element.name!=chkbname && this_element.name.match(chkname))
				this_element.checked=true;
		}
	}
	else
	{
		for (i=0; i<element_len; i++)
		{
			this_element = frm.elements[i];
			if (this_element.type == 'checkbox' && this_element.name!=chkbname && this_element.name.match(chkname))
				this_element.checked=false;
		}
	}
	return true;
}