DOM createElement

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_divBG = document.createElement("div"); _divBG.style.position = "absolute"; _divBG.style.top  = 0; _divBG.style.left = 0; _divBG.style.backgroundColor = "black"; _divBG.style.width  = document.body.clientWidth; _divBG.style.height = document.body.clientHeight; _divBG.style.filter = "alpha(opacity=20)"; _divBG.style.zIndex = 99; _divBG.style.display = "block";       document.body.appendChild(_divBG);