function Switch(objName)
{
	var divs = new Array('big_pic_0','big_pic_1','big_pic_2','big_pic_3');
	var i;
	
	for (i=0; i<divs.length;i++) {
		var y = new getObj(divs[i]);
		y.style.display = 'none';
	}
	
	var x = new getObj(objName);
	
	x.style.display = (x.style.display == 'block') ? 'none' : 'block';
}

function Hide(objName) {
	var x = new getObj(objName);
	x.style.display = 'none';
}

function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  }
}