You can use twitter bootstrap grid features . Sort of:
<div class="row">
<div class="span6">
<form>[...]</form>
</div>
<div class="span6">
<form>[...]</form>
</div>
</div>
EDIT:
with Twitter Bootstrap 3.x
<div class="row">
<div class="col-sm-6">
<form>[...]</form>
</div>
<div class="col-sm-6">
<form>[...]</form>
</div>
</div>
nb: in col sm -6, smmeans small, this means that this grid will only be used for devices with a view space larger than 768px(with default TWBS settings)
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