function openWindow(width,height,url,name) {
    x = (800 - width)/2, y = (600 - height)/2;

    if (screen) {
        y = (screen.availHeight - height)/2;
        x = (screen.availWidth - width)/2;
    }
	if (screen.availWidth > 1800) { 
	x = ((screen.availWidth/2) - width)/2; 
    } 
	window.open(url,name,'width=' + width + ',height=' + height + ',screenX=' + x + ',screenY=' + y + ',top=' + y + ',left=' + x + ',scrollbars=no');
}
function port1(){openWindow(546,478,'portfolio/1.html','portfolio');}
function port2(){openWindow(546,478,'portfolio/2.html','portfolio');}
function port3(){openWindow(546,478,'portfolio/3.html','portfolio');}
function port4(){openWindow(705,478,'portfolio/4.html','portfolio');}
function port5(){openWindow(546,478,'portfolio/7.html','portfolio');}
function port6(){openWindow(546,478,'portfolio/6.html','portfolio');}
function port7(){openWindow(546,478,'portfolio/5.html','portfolio');}
function port8(){openWindow(546,478,'portfolio/8.html','portfolio');}
function port9(){openWindow(546,478,'portfolio/9.html','portfolio');}
function port10(){openWindow(546,478,'portfolio/10.html','portfolio');}