you have given fixed width in div id as block 1 remove it and use float: left in css
and your code will be as follows:
following changes are in
remove div's width.
<div id="blcok1">
give style to i frame and set is as float:left
<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0"
src="https://maps.google.co.in/maps?hl=en&q=KAILAS+JEEVAN+FACTORY+-
+Pune&ie=UTF8&hq=KAILAS+JEEVAN+FACTORY+-&hnear=Pune,+
Maharashtra&t=m&ll=18.4468,73.813486&spn=0.161987,0.095167&output=embed" style="float:left;">
and in form also give it style and set it as a float:left
<form method = "post" action = "ContactServlet" style="float:left;">
for more help..click here.