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function main(url, width, height) {
var Win = window.open(url, "displayWindow", 'width=' + width + ', height=' + height + ', resizable=1, scrollbars=yes, menubar=no, toolbar=no, location=no, directories=no, status=no, buttons=no, copyhistory=no, locationbar=no, titlebar=no, allwayslowered=no, left='+(screen.width/2-width/2)+', top='+(screen.height/2-height/2));

}
//-->