function showdiv(divnum,divbefor){
        for(i=1;i<=divnum;i++){
				if(i==divbefor){
						document.getElementById("LeftNav"+i).className = "Nav1"
						document.getElementById("div"+i).className ="Nav_Content1";
				}else{
						document.getElementById("div"+i).className ="Nav_Content2";
						document.getElementById("LeftNav"+i).className = "Nav2"
				}
        }
}