function window_main_site_manager(url,largura,altura)
{  
   var marg_top=0,marg_left=0;
   if(largura<=0) largura = 720;
   if(altura<=0) altura = 430;  
   getPageSize();          
   marg_top = (arrayPageSize[3]/2)-(altura/2);
   marg_left= (arrayPageSize[2]/2)-(largura/2);
   window.open(url,'page','toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=yes,top='+marg_top+',left='+marg_left+',width='+largura+',height='+altura+'');      
}
  
function showHide_sn(id) {
    var obj = document.getElementById(id);
    if(obj.className == "") obj.className = "ocultaObj_sn";
    else  obj.className = "";
}

function getPageSize() {
	     var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}

		arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);		
}