Warning: Cannot modify header information – headers already sent by

Hello folks,
Esmi, thanks for the links – that was the first thing I though of, yet it doesn’t seem to apply – well, it might, as we seem to be generating part of a header with the echo function command to tell the browser that it is a javascript script, yet it doesn’t seem to use the refresh/redirect techniques that I have come to expect.

Here is the function, and the code for line 123, as suggested by the error message, and esmi’s links, it is the finial else test, where the line being executed is echo “<script …

function do_item( $handle, $group = false ) {
		if ( !parent::do_item($handle) )
			return false;

		if ( 0 === $group && $this->groups[$handle] > 0 ) {
			$this->in_footer[] = $handle;
			return false;
		}

		if ( false === $group && in_array($handle, $this->in_footer, true) )
			$this->in_footer = array_diff( $this->in_footer, (array) $handle );

		$ver = $this->registered[$handle]->ver ? $this->registered[$handle]->ver : $this->default_version;
		if ( isset($this->args[$handle]) )
			$ver .= '&' . $this->args[$handle];

		$src = $this->registered[$handle]->src;

		if ( $this->do_concat ) {
			$srce = apply_filters( 'script_loader_src', $src, $handle );
			if ( $this->in_default_dir($srce) ) {
				$this->print_code .= $this->print_scripts_l10n( $handle, false );
				$this->concat .= "$handle,";
				$this->concat_version .= "$handle$ver";
				return true;
			} else {
				$this->ext_handles .= "$handle,";
				$this->ext_version .= "$handle$ver";
			}
		}

		$this->print_scripts_l10n( $handle );
		if ( !preg_match('|^https?://|', $src) && ! ( $this->content_url && 0 === strpos($src, $this->content_url) ) ) {
			$src = $this->base_url . $src;
		}

		$src = add_query_arg('ver', $ver, $src);
		$src = esc_url(apply_filters( 'script_loader_src', $src, $handle ));

		if ( $this->do_concat )
			$this->print_html .= "<script type='text/javascript' src='$src'></script>\n";
		else
			<strong>echo "<script type='text/javascript' src='$src'></script>\n";</strong>

		return true;
	}

Thanks again folks for taking a look