Finally I traced out !!
Here is the solution ,
For Space Between Search TextBox and Search Courses Button
go to course\lib.php
Search for the line -"$output .= "<input type=\"text\" size=20 name=\"search\" value=\"$value\">";" and add some spacer image or according to the space required .
For Size of Turneditingon button
Go to lib/weblib.php
Search for the line
"<input type=\"submit\" value=\"$string\" /> add a new class here say "trunon"
"<input type=\"submit\" class=\"turnon\" value=\"$string\" /> and define the properties in styles.php
.turnon{width:210px;} etc .