function setPosition(id, position) {
        
        var store = {
            ram : {
                top : 0,
                left : 0,
                right : 0,
                bottom : 0
            },
            rom : {
                top : null,
                left : null,
                right : null,
                bottom : null
            }
        };
        
        
        for (var i in position) {store.rom[i] = position[i];}
        
        var element = document.getElementById(id);
        
        for (i in store) {element[i] = store[i];}
        
        element.rom.move = function() {
            
            if (window.innerHeight) {
                var topPage = window.pageYOffset;
                var leftPage = window.pageXOffset;
                var rightPage = leftPage + window.innerWidth - element.offsetWidth;
                var bottomPage = topPage + window.innerHeight - element.offsetHeight;
            }
            else {
                var topPage = document.body.scrollTop;  
                var leftPage = document.body.scrollLeft;
                var rightPage = leftPage + document.body.clientWidth - element.offsetWidth;
                var bottomPage = topPage + document.body.clientHeight - element.offsetHeight;
            }
            

            element.style.position = "absolute";
            
            if (element.rom.top != null) {
                element.ram.top += Math.round((topPage + element.rom.top - element.ram.top)/20);
                element.style.top = element.ram.top;
            }
            if (element.rom.left != null) {
                element.ram.left += Math.round((leftPage + element.rom.left - element.ram.left)/20);
                element.style.left = element.ram.left;
            }
            if (element.rom.right != null) {
                element.ram.right += Math.round((rightPage - element.rom.right - element.ram.right)/20);
                element.style.left = element.ram.right;
            }
            if (element.rom.bottom != null) {
                element.ram.bottom += Math.round((bottomPage - element.rom.bottom - element.ram.bottom)/20);
                element.style.top = element.ram.bottom;
            }
            
            setTimeout("document.getElementById('"+element.id+"').rom.move()",10);
        
        };    
        
        element.rom.move();
    }
    

    setPosition("a", {top: 70, right: 15});
    setPosition("b", {bottom: 20, right: 30});
    setPosition("c", {top: 20, left: 30});