diff --git a/src/lab/exp1/content.html b/src/lab/exp1/content.html
index 2b008550..022845eb 100644
--- a/src/lab/exp1/content.html
+++ b/src/lab/exp1/content.html
@@ -490,15 +490,13 @@ <h3><a href="sd.html" >Steepest Decent Method</a></h3>
                 Simple_harmonic_motion">http://en.wikipedia.org/wiki/Simple_harmonic_motion</a>
               </li>
               <li>
-                <a href="http://www.physics.uoguelph.ca/
-                tutorials/shm/Q.shm.html">http://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html</a>
+                <a href="https://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html">http://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html</a>
               </li> 
               <li>
                 Dynamics of structures by Anil K chopra. 
               </li> 
               <li>
-                <a href="http://surendranath.tripod.com/Applets/
-                Oscillations/SHM/SHMApplet.html">http://surendranath.tripod.com/Applets/Oscillations/SHM/SHMApplet.html</a> 
+                <a href="http://www.surendranath.org/GPA/Oscillations/SHM/SHM.html">http://surendranath.tripod.com/Applets/Oscillations/SHM/SHMApplet.html</a> 
               </li>
             </ul>
           </div>
diff --git a/src/lab/exp10/experiment/bottom.html b/src/lab/exp10/experiment/bottom.html
index 2c4542e0..09d7de3a 100644
--- a/src/lab/exp10/experiment/bottom.html
+++ b/src/lab/exp10/experiment/bottom.html
@@ -17,8 +17,8 @@
 				<td style="padding-left:20px;font-size:13px;font-style: italic;" width="320px">
 					Many reactions occur in a single step if the reactants collide with a suffucient energy and specific orientation to form a product. However, many reactions do not occur in a single step but follows multi-steps where it goes through many intermediate levels in a half-way and finally leads to product. These intermediate levels are known as transition states ....	 
 					<br/><br/>
-					<a href="../index.html" target="_blank" style="font-size:14px;color:#FFCC00;text-decoration:none;float:right">Read More&gt;&gt;</a>
+					<a href="../_index.html" target="_blank" style="font-size:14px;color:#FFCC00;text-decoration:none;float:right">Read More&gt;&gt;</a>
 				</td>
 		</tr>
 </table>
-<img src="images/ma-hrline.jpg" style="padding-left:3px;width:1050px;height:4px;"/>
\ No newline at end of file
+<img src="images/ma-hrline.jpg" style="padding-left:3px;width:1050px;height:4px;"/>
diff --git a/src/lab/exp3/default.html b/src/lab/exp3/default.html
index 48145056..8a25bce8 100644
--- a/src/lab/exp3/default.html
+++ b/src/lab/exp3/default.html
@@ -390,15 +390,13 @@ <h3>Observation 1:</h3>
                 Simple_harmonic_motion">http://en.wikipedia.org/wiki/Simple_harmonic_motion</a>
               </li>
               <li>
-                <a href="http://www.physics.uoguelph.ca/
-                tutorials/shm/Q.shm.html">http://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html</a>
+                <a href="https://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html">https://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html</a>
               </li> 
               <li>
                 “Dynamics of structures” by Anil K chopra. 
               </li> 
               <li>
-                <a href="http://surendranath.tripod.com/Applets/
-                Oscillations/SHM/SHMApplet.html">http://surendranath.tripod.com/Applets/Oscillations/SHM/SHMApplet.html</a> 
+                <a href="http://www.surendranath.org/GPA/Oscillations/SHM/SHM.html">http://surendranath.tripod.com/Applets/Oscillations/SHM/SHMApplet.html</a> 
               </li>
             </ul>
           </div>
diff --git a/src/lab/exp4/content.html b/src/lab/exp4/content.html
index ab6835b8..1c5a249c 100644
--- a/src/lab/exp4/content.html
+++ b/src/lab/exp4/content.html
@@ -348,7 +348,7 @@ <h2>Quiz</h2>
 	Always gives lower energy </font> <br>
 	<input name="q1" id="q1" value="2" type="radio"><font color="black">
 	Is optimized for small molecules </font> <br>
-	<input name="q1" id="q1" value="1" type="radio"> <font color="black">
+	<input name="q1" id="q1" value="1" type="radio" > <font color="black">
 	Contains one basis function for each atomic orbital </font> <br>
 	<input name="q1" id="q1" value="0" type="radio"><font color="black">
 	None of the above </font> <br>
@@ -359,7 +359,7 @@ <h2>Quiz</h2>
 	6-31G* </font> <br>
 	<input name="q2" id="q2" value="2" type="radio"><font color="black">
 	6-31G(d) </font> <br>
-	<input name="q2" id="q2" value="1" type="radio"> <font color="black">
+	<input name="q2" id="q2" value="1" type="radio" > <font color="black">
 	3-21G </font> <br>
 	<input name="q2" id="q2" value="0" type="radio"><font color="black">
 	None of the above </font> <br>
diff --git a/src/lab/exp8/experiment/matrix.php b/src/lab/exp8/experiment/matrix.php
index dbe8da43..0f854109 100755
--- a/src/lab/exp8/experiment/matrix.php
+++ b/src/lab/exp8/experiment/matrix.php
@@ -165,7 +165,7 @@ function changeVal(input,row,col){
 					<tr>
 					<td>use</td>
 					<td><img src="images/x_.png"></img></td>
-					<td><a href="../index.html">see in main theory.</a> </td>
+					<td><a href="http://ccnsb04-iiith.virtual-labs.ac.in/exp8/index.php?section=Theory">see in main theory.</a> </td>
 					</tr>
 					</table>
 					</li>
diff --git a/src/lab/js/quiz.js b/src/lab/js/quiz.js
index 05d05939..b8b7cd6f 100644
--- a/src/lab/js/quiz.js
+++ b/src/lab/js/quiz.js
@@ -1,34 +1,54 @@
-	function checkAns(form)
+function checkAns(form)
 	{
-		wrong="";
+		correct="";
 		var flag=0;
+		var a=0;
+		var b=0;
+		var c=0;
 		for(i=1;i<=len;++i)
 		{
 			var ll = form["q"+i].length;
 			var sel=-1;
 			for(j=0;j<ll;++j)
 			{
-				if(form["q"+i][j].checked)
+				if(form["q"+i][j].checked){
+					
 					sel=j;
-			}
-			if(Ans["q"+i]!=parseInt(sel)){
-				wrong+="Q"+i+", ";
-				flag++;
-			}
+					a++;
+					
+				  if(Ans["q"+i]==parseInt(sel)){
+		          	
+		          correct+="Q"+i+", ";
+		          flag++;
+				   c++;}
+				  else if(Ans["q"+i]!=parseInt(sel)){
+				   flag++;}
+				}
+
+				
+				/*else if(!form["q"+i][j].checked){
+					b++;
+					}*/
+				}
 		}
-		wrong = wrong.substring(0,wrong.length-2);
-		if(flag>1){
-		if(wrong!="")
-			alert(wrong +"  are wrong");
-		else 
-			alert("all ans are correct.")
+
+
+		correct = correct.substring(0,correct.length-2);
+		if(flag>=1){
+		if(correct!="")
+			alert(correct+"  correct");
+		else if(correct=="")
+			alert("None are correct");
 		return false;
 		}
 		else {
-		if(wrong!="")
-			alert(wrong +"  is wrong");
-		else 
-			alert("all ans are correct.")
+		if(a===0)
+			alert("Please attempt atleast one question");
+		if(c===len)
+			{alert('All Answers are correct');}
+		/*else
+			alert("all ans are correct.");*/
 		return false;
-		}
 	}
+		
+		}