function myPopupRelocate() {
 var scrolledX, scrolledY;
 if( self.pageYOffset ) {
   scrolledX = self.pageXOffset;
   scrolledY = self.pageYOffset;
 } else if( document.documentElement && document.documentElement.scrollTop ) {
   scrolledX = document.documentElement.scrollLeft;
   scrolledY = document.documentElement.scrollTop;
 } else if( document.body ) {
   scrolledX = document.body.scrollLeft;
   scrolledY = document.body.scrollTop;
 }

 var centerX, centerY;
 if( self.innerHeight ) {
   centerX = self.innerWidth;
   centerY = self.innerHeight;
 } else if( document.documentElement && document.documentElement.clientHeight ) {
   centerX = document.documentElement.clientWidth;
   centerY = document.documentElement.clientHeight;
 } else if( document.body ) {
   centerX = document.body.clientWidth;
   centerY = document.body.clientHeight;
 }

 var leftOffset = scrolledX + (centerX - 450) / 2;
 var topOffset = scrolledY + (centerY - 400) / 2;

 document.getElementById("mypopupa").style.top = topOffset + "px";
 document.getElementById("mypopupa").style.left = leftOffset + "px";
document.getElementById("mypopupb").style.top = topOffset + "px";
 document.getElementById("mypopupb").style.left = leftOffset + "px";
document.getElementById("mypopupc").style.top = topOffset + "px";
 document.getElementById("mypopupc").style.left = leftOffset + "px";
}

	  
	  function testtesta() {
		  myPopupRelocate();
	document.getElementById("mypopupa").style.display="block";
      }
	  
	  function testtesta2() {
	document.getElementById("mypopupa").style.display="none";
      }
 function testtestb() {
		  myPopupRelocate();
	document.getElementById("mypopupb").style.display="block";
      }
	  
	  function testtestb2() {
	document.getElementById("mypopupb").style.display="none";
      }
 function testtestc() {
		  myPopupRelocate();
	document.getElementById("mypopupc").style.display="block";
      }
	  
	  function testtestc2() {
	document.getElementById("mypopupc").style.display="none";
      }