function roll(img_name1, img_src1, home1, home2, home3, home4)
   {
     document[img_name1].src = img_src1;
	 document.getElementById(home1).style.display = home2;
	 document.getElementById(home3).style.display = home4;
	}
	
function showvideo1()
        {
            var obj1 = document.getElementById("video1");
            var obj2 = document.getElementById("btn1a");
			var obj3 = document.getElementById("btn1b");
            obj1.style.display = "block";
            obj2.style.display = "none";
			obj3.style.display = "block";
        }
function hidevideo1()
        {
            var obj1 = document.getElementById("video1");
            var obj2 = document.getElementById("btn1a");
            var obj3 = document.getElementById("btn1b");
            obj1.style.display = "none";
            obj2.style.display = "block";
			obj3.style.display = "none";
        }
function showvideo2()
        {
            var obj1 = document.getElementById("video2");
            var obj2 = document.getElementById("btn2a");
			var obj3 = document.getElementById("btn2b");
            obj1.style.display = "block";
            obj2.style.display = "none";
			obj3.style.display = "block";
        }
function hidevideo2()
        {
            var obj1 = document.getElementById("video2");
            var obj2 = document.getElementById("btn2a");
            var obj3 = document.getElementById("btn2b");
            obj1.style.display = "none";
            obj2.style.display = "block";
			obj3.style.display = "none";
        }
function showvideo3()
        {
            var obj1 = document.getElementById("video3");
            var obj2 = document.getElementById("btn3a");
			var obj3 = document.getElementById("btn3b");
            obj1.style.display = "block";
            obj2.style.display = "none";
			obj3.style.display = "block";
        }
function hidevideo3()
        {
            var obj1 = document.getElementById("video3");
            var obj2 = document.getElementById("btn3a");
            var obj3 = document.getElementById("btn3b");
            obj1.style.display = "none";
            obj2.style.display = "block";
			obj3.style.display = "none";
        }
function showvideo4()
        {
            var obj1 = document.getElementById("video4");
            var obj2 = document.getElementById("btn4a");
			var obj3 = document.getElementById("btn4b");
            obj1.style.display = "block";
            obj2.style.display = "none";
			obj3.style.display = "block";
        }
function hidevideo4()
        {
            var obj1 = document.getElementById("video4");
            var obj2 = document.getElementById("btn4a");
            var obj3 = document.getElementById("btn4b");
            obj1.style.display = "none";
            obj2.style.display = "block";
			obj3.style.display = "none";
        }
function showvideo5()
        {
            var obj1 = document.getElementById("video5");
            var obj2 = document.getElementById("btn5a");
			var obj3 = document.getElementById("btn5b");
            obj1.style.display = "block";
            obj2.style.display = "none";
			obj3.style.display = "block";
        }
function hidevideo5()
        {
            var obj1 = document.getElementById("video5");
            var obj2 = document.getElementById("btn5a");
            var obj3 = document.getElementById("btn5b");
            obj1.style.display = "none";
            obj2.style.display = "block";
			obj3.style.display = "none";
        }