sh_statess=new Array()
sh_statess[0]="sh_a" 
sh_statess[1]="sh_b" 
sh_statess[2]="sh_c"

function sh_hideAllExcept(sh_elm) { 
for (var i = 0; i < sh_statess.length; i++) { 
var layer = document.getElementById(sh_statess[i]); 
if (sh_elm!= sh_statess[i]) { 
layer.style.display = "none";

} 
else{ 
layer.style.display = "block";
	} 
	}
}