function circles className var selector className if topPx selector cs

function circles(className){
    var selector = "." + className;

    if (a == 1) {
        topPx = $(selector).css('top');
        leftPx = $(selector).css('left');

        var newTopPx = parseInt(topPx.substring(0, topPx.length - 2)) - 25;
        var newLeftPx = parseInt(leftPx.substring(0, leftPx.length - 2)) - 25;

        background = $(selector).css('background-image');

        $(selector).css('background', '#2358A3');
        $(selector).animate({
            width:"250px",
            height:"250px",
            borderRadius:"150px",
            top:newTopPx + "px",
            left:newLeftPx + "px"
        }, 50);
        a = a * -1;
    }
    else{
        $(selector).css('background-image', background);
        $(selector).css('background-size', 'contain');
        $(selector).animate({
            width:"200px",
            height:"200px",
            borderRadius:"110px",
            top:topPx,
            left:leftPx
        }, 50);
        a = a * -1;
    }
}