function MM_findObj(n, d) { //v4.0
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
obj.visibility=v; }
}

 var arr = ['C1','C2', 'C3', 'C4', 'C5', 'C6', 'C7', 'C8'];
 
 function Cla_hideLayers(){
 
 if( document.all ){
        for( i=0; i<arr.length; i++){
                document.all[ arr[i] ].style.visibility = 'hidden';
        }
 } else {
        for( i=0; i<arr.length; i++){
                x = document.getElementById( arr[i] );
                x.style.visibility = 'hidden';
        }
 }
 
}