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Inserting Multiple Lines (with newline) using sed or awk

So far, I've only done basic substitution with sed, so dont know if this is possible.

I need to replace part of a line in a file with multiple lines, however need to separate each line with a newline is this possible?

Example, need to remove line 2
</head>
<h1>My Blog</h1>

and insert line similar to below:
--snip
</head>
<body background="gifs/blue.gif">
<table class="table-head">
<tr>
<td><img src="jpgs/image_a.jpg" border="0"></td>
<td valign="middle" align="center" style="font-size: 40px; color:red">My Blog</td>
<td><img src="jpgs/image_b.jpg" align="right" border="0"></td>
</tr>

If the multiple lines were part of a text file, would inserting a text file automatically include newline characters?

Thanks in advance to anyone who can help?

Put the lines you want to add into another file, and then feed that into your sed command using the r filename syntax.

Here's an example:

Code:

telemachus ~/practice $ cat practice 

foo

bar

baz

telemachus ~/practice $ cat file 

cats

love

dogs

telemachus ~/practice $ sed '/foo/ r file' < practice 

foo

cats

love

dogs

bar

baz

See here for more: http://www.grymoire.com/Unix/Sed.html#uh-37