hiding showing divs

well ive tried a different fashion can anyone maybe tell me

how to accomplish what i stated in my former post
i dont get into javascript too frequently

i have three divs with each their id
i need locate the objects within the dom first
i would also like to place it in an external file

dont know if this is the right syntax here
any help would be greatly appreciated

function findObj("brands","services","liability")
{
var p, i, foundObj;

if(!theDoc) theDoc = document;
if( (p = theObj.indexOf("?")) > 0 && parent.frames.length)
{
theDoc = parent.frames[theObj.substring(p+1)].document;
theObj = theObj.substring(0,p);
}
if(!(foundObj = theDoc[theObj]) && theDoc.all) foundObj = theDoc.all[theObj];
for (i=0; !foundObj && i < theDoc.forms.length; i++)
foundObj = theDoc.forms[theObj];
for(i=0; !foundObj && theDoc.layers && i < theDoc.layers.length; i++)
foundObj = findObj(theObj,theDoc.layers.document);
if(!foundObj && document.getElementById) foundObj = document.getElementById(theObj);

return foundObj;
}

function showHideLayers(brands,'','show',services,'','hide',liability,'','hide');
{
var i, visStr, obj, args = showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3)
{
if ((obj = findObj(args)) != null)
{
visStr = args[i+2];
if (obj.style)
{
obj = obj.style;
if(visStr == 'show') visStr = 'visible';
else if(visStr == 'hide') visStr = 'hidden';
}
obj.visibility = visStr;
}
}
}