function showpic(ob,obwidth,obheight)
{
var allbox=document.getElementById("allbox")
if(allbox!==null)
{
	document.body.removeChild(allbox)
}
var screenwidth=(document.body.scrollWidth)
var newlayer=document.createElement("div")
newlayer.style.cssText="width:"+screenwidth+"px;text-align:center;position:absolute; top:420px; left:0; z-index:600;clear:both;"
newlayer.setAttribute("id","allbox")

var ahref=document.createElement("a")
ahref.setAttribute("href","#")
ahref.style.cssText="border:none;"

var pic=document.createElement("img")
pic.setAttribute("src",ob)
pic.style.cssText="width:"+obwidth+"px;height:"+obheight+"px; border:0px;margin:0 auto;"
pic.onclick=function()
{
document.body.removeChild(newlayer)
}

var pic_box=document.createElement("div")
pic_box_width=obwidth+20
pic_box_height=obheight+10
pic_box.style.cssText="width:"+pic_box_width+"px;height:"+pic_box_height+"px; margin:0 auto; background:#eee;"
ahref.appendChild(pic)
pic_box.appendChild(ahref)
newlayer.appendChild(pic_box)
document.body.appendChild(newlayer)

}