function open_window(url) {
	win = window.open(url,"window",
	 'scrollbars=1,resizable=0,width=500,height=375');
	 if(window.focus)
	 {
	    win.focus();
	 }
}
function open_window_pdf(url) {
	win = window.open(url,"window",
	 'scrollbars=1,resizable=1,width=450,height=575');
	 if(window.focus)
	 {
	    win.focus();
	 }
}
function open_window_ppt(url) {
	win = window.open(url,"window",
	 'scrollbars=1,resizable=1,width=725,height=575');
	 if(window.focus)
	 {
	    win.focus();
	 }
}