function is_email(string)
{
	var email_reg_expr = /^[a-zA-Z0-9\-\.\_]+@{1}[a-zA-Z0-9\-\.\_]+\.{1}[a-zA-Z0-9]{2,4}$/;
	return email_reg_expr.test(string);
	return false;
}

var cart_colors = new Array("#AAAAAA","#BBBBBB","#CCCCCC","#DDDDDD","#EEEEEE","#FFFFFF");
var cart_color_selected = 0;
var cart_timer = null;

function wink_cart() {    
    cart_color_selected = 0;
    cart_timer = setTimeout("cart_change_color()", 50);
}

function cart_change_color() {
    var cart = document.getElementById("cart_block");
    //alert(cart_color. length);
    if(cart_color_selected < cart_colors.length) {
        cart.style.backgroundColor = cart_colors[cart_color_selected];
        cart_color_selected++;
        cart_timer = setTimeout("cart_change_color()", 50);
    }
    else {
        clearTimeout(cart_timer);
        cart_timer = null;
    }
}

function popup (L,H,F,TL,SR,ST) {
	var vpos=(screen.height-H)/2;
	var hpos=(screen.width-L)/2;
	window.open(F,'','top='+vpos+',left='+hpos+',width='+L+',height='+H+',toolbar='+TL+', scrollbars='+SR+',status='+ST+'');
}