jQuery center element to viewport using center plugin

Question

I am currently using the jQuery center plugin to center my div element and so far it works to an extend where it does center it to the containing parent container. What I want

Answer 1

Use

jQuery( "#element_id" ).css( 'top', parseInt( ( jQuery( window ).height() / 2 ) + jQuery( document ).scrollTop() - jQuery( "#element_id" ).height() ) );
jQuery( "#element_id" ).css( 'left', parseInt( ( jQuery( document ).width() / 2 ) + jQuery( document ).scrollLeft() - jQuery( "#element_id" ).width() ) );