// JavaScript Document

  function getElementsByClass(searchClass) {

   if (document.all) {
        var classElements = new Array();
        var allElements = document.all;
            for (i = 0, j = 0; i < allElements.length; i++) {
                if (allElements[i].className == searchClass) {
                    classElements[j] = allElements[i];
                    j++;
                }
            }    
   } else if (document.getElementsByTagName) {
        var classElements = new Array();
        var allElements = document.getElementsByTagName("*");
            for (i = 0, j = 0; i < allElements.length; i++) {
                if (allElements[i].className == searchClass) {
                    classElements[j] = allElements[i];
                    j++;
                }
            }        
   } else {
      return;
   }

    return classElements;
}

function change_center_img(displayId) { //v3.0
  hide_center_img();
  document.getElementById(displayId).style.display = 'block'; 
}

function  hide_center_img_old(){
	divElements = document.getElementsByName("div");
	for (i = 0; i < divElements.length; i++) {
    	divElement = divElements[i];
       	if(divElement.className == 'socialcenter'){
			divElement.style.display = 'none'; 
		}
	}
}

function  hide_center_img(){
	socialcenterElements = getElementsByClass('socialcenter');
	for (i = 0; i < socialcenterElements.length; i++) {
    	socialcenterElement = socialcenterElements[i];
		socialcenterElement.style.display = 'none'; 
	}
}