// Obtiene la anchura del navegador
function getbrowserwidth(){

	if (navigator.userAgent.indexOf("MSIE") > 0){

		return(document.body.clientWidth);
	
	} else {
		
		return window.outerWidth;
		
	} //end if

} //end getbrowserwidth()


//Obtiene la altura del navegador
function getbrowserheight(){
	
	if (navigator.userAgent.indexOf("MSIE") > 0){

		return(document.body.clientHeight);

	}  else {

		return(window.outerHeight);
	} //end if

} //end getbrowserheight


var popup = new Object()


//Centra la emergente en pantalla
function centrar_popup(URL, width, height){
	
	var X = getbrowserwidth() / 2
	var Y = getbrowserheight() / 2
	popup = window.open(URL, 'PopUp', 'scrollbars=yes ' + 'width=' + width + ' ' + 'height=' + height + ' ' + 'top=' + (window.screenTop + (Y - (height/2))) + ' ' + 'left=' + (window.screenLeft + (X - (width/2))))
	popup.focus()

} //end centrar_popup