$(document).ready(function() {
    if(screen.width == 1920) {
	
		$('#jQuery_background_left').attr('id', 'background_left_1920');
		$('#jQuery_background_right').attr('id', 'background_right_1920');
		
		console.log('ScreenWidth = ' + screen.width);
		console.log('Background left and right are visible');
		
	} else if(screen.width == 1680) {
		
		$('#jQuery_background_left').attr('id', 'background_left_1680');
		$('#jQuery_background_right').attr('id', 'background_right_1680');
		
		console.log('ScreenWidth = ' + screen.width);
		console.log('Background left and right are visible');
		
	} else if(screen.width == 1600) {
		
		$('#jQuery_background_left').attr('id', 'background_left_1600');
		$('#jQuery_background_right').attr('id', 'background_right_1600');
		
		console.log('ScreenWidth = ' + screen.width);
		console.log('Background left and right are visible');
	}
});