make the back button back to the last page ,not a herf

OfficeJS-Mobile/index.html

@@ -51,7 +51,7 @@ $('#input_json_applicant').attr('value'));">
 <!-----------------------------------------------------Tools Page-------------------------------------------------------------->
     <div data-role="page" id="tools">
       <div data-role="header">
-	<a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" href="#home" data-theme="a">
+	<a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" data-rel="back" data-theme="a">
 	  <span class="ui-btn-inner ui-btn-corner-all">
 	    <span class="ui-icon ui-icon-arrow-l ui-icon-shadow"></span>
 	    <span class="ui-btn-text">Back</span>
@@ -96,7 +96,7 @@ $('#input_json_applicant').attr('value'));">
 <!-------------------------------------------------------List Page------------------------------------------------------------->
     <div data-role="page" id="list">
       <div data-role="header">
-        <a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" href="#tools" data-theme="a">
+        <a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" data-rel="back" data-theme="a">
           <span class="ui-btn-inner ui-btn-corner-all">
             <span class="ui-icon ui-icon-arrow-l ui-icon-shadow"></span>
             <span class="ui-btn-text">Back</span>
@@ -117,7 +117,7 @@ $('#input_json_applicant').attr('value'));">
 <!---------------------------------------------------------Text Page------------------------------------------------------------->
     <div data-role="page" id="text">
       <div data-role="header">
-        <a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" href="#tools" data-theme="a">
+        <a class="ui-btn-left ui-btn ui-btn-icon-left ui-btn-corner-all ui-shadow ui-btn-up-a" data-icon="arrow-l" data-rel="back" data-theme="a">
           <span class="ui-btn-inner ui-btn-corner-all">
             <span class="ui-icon ui-icon-arrow-l ui-icon-shadow"></span>
             <span class="ui-btn-text">Back</span>