function show_brands(){document.getElementById('shower').style.display='none';document.getElementById('cat_all').style.display='inline';}
function hide_brands(){document.getElementById('shower').style.display='block';document.getElementById('cat_all').style.display='none';}
function add_to_cart(a){document.getElementById('cart_hint').src="/cart.php?a=add&item=" + a;}
var tmr=0;
function show_placed_msg(){showdeadcenterdiv(250,30,'itemplaced');tmr=setInterval('hide_placed_msg()', 1000);}
function hide_placed_msg(){document.getElementById('itemplaced').style.display='none';clearInterval(tmr);}

function showdeadcenterdiv(Xwidth,Yheight,divid) {
// First, determine how much the visitor has scrolled

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;
}

// Next, determine the coordinates of the center of browser's window

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;
}

// Xwidth is the width of the div, Yheight is the height of the
// div passed as arguments to the function:
var leftoffset = scrolledX + (centerX - Xwidth) / 2;
var topoffset = scrolledY + (centerY - Yheight) / 2;
// The initial width and height of the div can be set in the
// style sheet with display:none; divid is passed as an argument to // the function
var o=document.getElementById(divid);
var r=o.style;
r.position='absolute';
r.top = topoffset + 'px';
r.left = leftoffset + 'px';
r.display = "block";
}