var ScreenWidth = 0; 
var ScreenHeight = 0;
var WindowLeftMargin = 0
var WindowTopMargin = 0;
var UseableWidth = 0;
var UseableHeight = 0;
var PageWidth = 0;
var Margin = 20;
var PageLeft = 0;

//==========================================================================================
function Layout()
{
	// Set Positions, Widths & Heights of components
	//----------------------------------------------
	   with (Math)
	{
		// Only used onloading or when Window size has changed
		//----------------------------------------------------
		if( UseableWidth != document.body.clientWidth )
		{
			UseableWidth = document.body.clientWidth;
			
			if( UseableWidth > 800)
			{
				PageWidth = 800;
				PageLeft = parseInt((UseableWidth - PageWidth) / 2);
				
				document.getElementById("MainPage").style.width = PageWidth;
				document.getElementById("MainPage").style.left = PageLeft;
			}
			else
			{
				document.getElementById("MainPage").style.width = UseableWidth;
			}
		}
	}

	document.getElementById("MainPage").style.visibility = "visible";
}

//==========================================================================================
function DoImage(Img)
{
	MainPic.innerHTML= "<img src=\"./img/lg/img_0" + Img + ".jpg\">"; 
}

//==========================================================================================
function DoMenu(Item)
{
	alert("Hello");
}

//==========================================================================================
function submitform()
{
	 if(myForm.Comments.value.length < 500)
	 {
	 	myForm.submit();	
	 }
	 else
	 {
	 	myForm.Comments.value = "Comments too long: please re-enter brief comments";
	 }
}