function back1(Ind1, Ind2, Ind3, Ind4){
	var rightSide=document.getElementById(Ind3);
	var middleSide=document.getElementById(Ind2);
	var leftSide=document.getElementById(Ind1);
	leftSide.style.backgroundImage="url(images/transparent.gif)";
	rightSide.style.backgroundImage="url(images/transparent.gif)";
	middleSide.style.backgroundImage="url(images/transparent.gif)";
	var subMenu=document.getElementById(Ind4);
	subMenu.style.display="none";
	}
function next(Ind1, Ind2, Ind3, Ind4){
	var rightSide=document.getElementById(Ind3);
	var middleSide=document.getElementById(Ind2);
	var leftSide=document.getElementById(Ind1);
	leftSide.style.backgroundImage="url(images/left_side.gif)";
	rightSide.style.backgroundImage="url(images/right_side.gif)";
	middleSide.style.backgroundImage="url(images/inside.gif)";
	var subMenu=document.getElementById(Ind4);
	subMenu.style.display="block";
	subMenu.style.zIndex="2";
switch (Ind3){
case "right1":
back1("left2", "middle2", "right2", "submenu2");
back1("left3", "middle3", "right3", "submenu3");
back1("left4", "middle4", "right4", "submenu4");
back1("left5", "middle5", "right5", "submenu5");
back1("left6", "middle6", "right6", "submenu6");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right2":
back1("left1", "middle1", "right1", "submenu1");
back1("left3", "middle3", "right3", "submenu3");
back1("left4", "middle4", "right4", "submenu4");
back1("left5", "middle5", "right5", "submenu5");
back1("left6", "middle6", "right6", "submenu6");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right3":
back1("left1", "middle1", "right1", "submenu1");
back1("left2", "middle2", "right2", "submenu2");
back1("left4", "middle4", "right4", "submenu4");
back1("left5", "middle5", "right5", "submenu5");
back1("left6", "middle6", "right6", "submenu6");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right4":
back1("left1", "middle1", "right1", "submenu1");
back1("left2", "middle2", "right2", "submenu2");
back1("left3", "middle3", "right3", "submenu3");
back1("left5", "middle5", "right5", "submenu5");
back1("left6", "middle6", "right6", "submenu6");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right5":
back1("left1", "middle1", "right1", "submenu1");
back1("left2", "middle2", "right2", "submenu2");
back1("left3", "middle3", "right3", "submenu3");
back1("left4", "middle4", "right4", "submenu4");
back1("left6", "middle6", "right6", "submenu6");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right6":
back1("left1", "middle1", "right1", "submenu1");
back1("left2", "middle2", "right2", "submenu2");
back1("left3", "middle3", "right3", "submenu3");
back1("left4", "middle4", "right4", "submenu4");
back1("left5", "middle5", "right5", "submenu5");
back1("left7", "middle7", "right7", "submenu7");
break;
case "right7":
back1("left1", "middle1", "right1", "submenu1");
back1("left2", "middle2", "right2", "submenu2");
back1("left3", "middle3", "right3", "submenu3");
back1("left4", "middle4", "right4", "submenu4");
back1("left5", "middle5", "right5", "submenu5");
back1("left6", "middle6", "right6", "submenu6");
break;
	}}