function bg_getScrollWidth(){var w=window.pageXOffset||document.body.scrollLeft||document.documentElement.scrollLeft;return w?w:0}function bg_getScrollHeight(){var h=window.pageYOffset||document.body.scrollTop||document.documentElement.scrollTop;return h?h:0}function bg_show_div(divid){document.getElementById(divid).style.display="block"}function bg_hide_div(divid){document.getElementById(divid).style.display="none"}
function bg_showhide_div(divid){if(document.getElementById(divid).style.display=="block")bg_hide_div(divid);else bg_show_div(divid)}
function bg_set_div_to_center(divid){Xwidth=document.getElementById(divid).offsetWidth;Yheight=document.getElementById(divid).offsetHeight;var scrolledX=bg_getScrollWidth();var scrolledY=bg_getScrollHeight();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-Xwidth)/2;var topOffset=scrolledY+(centerY-Yheight)/2;document.getElementById(divid).style.left=leftoffset+"px";document.getElementById(divid).style.top=topOffset+"px"};