It's common to want to assign several styles to an element. Normally, you'd do that this way:
obj.style.position = 'absolute';
obj.style.top = '0px';
obj.style.left = '0px';
... etc ...
However, there's a way to pare this down to a single assignmentsaving time, reducing not only the number of assignments the browser needs to perform, but also the number of reflows to one. Here it is:
obj.setAttribute('style','position:absolute;top:0px;left:0px;... etc ...');