کد نمایش نقطه وسط صفحه

function getScrollXY() {
    var scrOfX = 0, scrOfY = 0;
    if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
    } else if( document.body && ( document.body.scrollLeft | document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
    } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;
    }
    return [ scrOfX, scrOfY ];
    }
    function getWindowSize() {
    var myWidth = 0, myHeight = 0;
    if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
    } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
    } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
    }
    return [ myWidth, myHeight ];
    }
    function DisplayCenteredWindow(el, width, height) {
    var x = getScrollXY()[0];
    var y = getScrollXY()[1];
    var halfWidth = width/2;
    var halfHeight = height/2;
    //var offsetX = 250 + x;
    //var offsetY = 100 + y;
    var sizeX = getWindowSize()[0];
    var sizeY = getWindowSize()[1];
    var cssLeft, cssTop;
    cssLeft = Math.ceil(sizeX / 2) - halfWidth + x;
    cssTop = Math.ceil(sizeY / 2) - halfHeight + y;
    $(el).css({position:'absolute', top:cssTop+'px', left:cssLeft+'px'});
    }