function SwitchIntro1(n){
if(n==1){
document.getElementById('c1').src ="images/cx11.png" 
document.getElementById('c2').src ="images/cx2.jpg" 
document.getElementById('c3').src ="images/cx3.jpg" 
}
if(n==2){
document.getElementById('c1').src ="images/cx1.jpg" 
document.getElementById('c2').src ="images/cx22.png" 
document.getElementById('c3').src ="images/cx3.jpg" 
}
if(n==3){
document.getElementById('c1').src ="images/cx1.jpg" 
document.getElementById('c2').src ="images/cx2.jpg" 
document.getElementById('c3').src ="images/cx33.png" 
}}
function SwitchIntro2(n){
if(n==1){
document.getElementById('l1').src ="../images/left_r6_c1.jpg"  
document.getElementById('l2').src ="../images/left_r4_c1.jpg" 
document.getElementById('l3').src ="../images/left_r5_c1.jpg" 
}
if(n==2){
document.getElementById('l1').src ="../images/left_r3_c1.jpg" 
document.getElementById('l2').src ="../images/left_r7_c1.jpg" 
document.getElementById('l3').src ="../images/left_r5_c1.jpg" 
}
if(n==3){
document.getElementById('l1').src ="../images/left_r3_c1.jpg" 
document.getElementById('l2').src ="../images/left_r4_c1.jpg" 
document.getElementById('l3').src ="../images/left_r8_c1.jpg" 
}}
function SwitchIntro3(n){
if(n==1){
document.getElementById('ll1').src ="../images/left1_r7_c1.jpg"  
document.getElementById('ll2').src ="../images/left1_r4_c1.jpg" 
document.getElementById('ll3').src ="../images/left1_r5_c1.jpg" 
document.getElementById('ll4').src ="../images/left1_r6_c1.jpg" 
}
if(n==2){
document.getElementById('ll1').src ="../images/left1_r3_c1.jpg"  
document.getElementById('ll2').src ="../images/left1_r8_c1.jpg" 
document.getElementById('ll3').src ="../images/left1_r5_c1.jpg" 
document.getElementById('ll4').src ="../images/left1_r6_c1.jpg" 
}
if(n==3){
document.getElementById('ll1').src ="../images/left1_r3_c1.jpg"  
document.getElementById('ll2').src ="../images/left1_r4_c1.jpg" 
document.getElementById('ll3').src ="../images/left1_r9_c1.jpg" 
document.getElementById('ll4').src ="../images/left1_r6_c1.jpg" 
}
if(n==4){
document.getElementById('ll1').src ="../images/left1_r3_c1.jpg"  
document.getElementById('ll2').src ="../images/left1_r4_c1.jpg" 
document.getElementById('ll3').src ="../images/left1_r5_c1.jpg" 
document.getElementById('ll4').src ="../images/left1_r10_c1.jpg" 
}}
function SwitchIntro4(n){
if(n==1){
document.getElementById('lll1').src ="../images/left2_r7_c1.jpg"  
document.getElementById('lll2').src ="../images/left2_r4_c1.jpg" 
document.getElementById('lll3').src ="../images/left2_r5_c1.jpg" 
}
if(n==2){
document.getElementById('lll1').src ="../images/left2_r3_c1.jpg" 
document.getElementById('lll2').src ="../images/left2_r8_c1.jpg" 
document.getElementById('lll3').src ="../images/left2_r5_c1.jpg" 
}
if(n==3){
document.getElementById('lll1').src ="../images/left2_r3_c1.jpg" 
document.getElementById('lll2').src ="../images/left2_r4_c1.jpg" 
document.getElementById('lll3').src ="../images/left2_r9_c1.jpg" 
}}