var win1Open 

function ouvre_google(lurl,winwidth,winheight)
	{
		if(win1Open != null)
		{
		if(!win1Open.closed)
			{
			win1Open.close();
			win1Open = null;
			}
		}
		win1Open = window.open(lurl,'popup','scrollbars=yes,width='+winwidth+',height='+winheight+',left=100,top=100,resizable=no');
		return false;
	}
	
function ouvre_popup(lurl,winwidth,winheight)
	{
		if(win1Open != null)
		{
		if(!win1Open.closed)
			{
			win1Open.close();
			win1Open = null;
			}
		}
		win1Open = window.open(lurl,'popup','scrollbars=yes,width='+winwidth+',height='+winheight+',left=100,top=100,resizable=yes');
		return false;
	}