var hspc = ovhspc; 		// horizontal image offset
var vspc = ovvspc; 		// vertical image offset

function cadrer(left,top,w,h) {
	
	//calculer les coordonnées image en fonction des coordonnées "terrain"
	zoomLeft = (left-ovmapXMin)/ovmapWidth*ovimgWidth;
	zoomBottom = ovimgHeight-(top-ovmapYMin)/ovmapHeight*ovimgHeight;
	zoomRight = zoomLeft+w/ovmapWidth*ovimgWidth;
	zoomTop = zoomBottom+h/ovmapHeight*ovimgHeight; 
    if((zoomRight-zoomLeft) < 2)
		zoomRight = zoomLeft+2;
    if((zoomTop-zoomBottom) < 2)
		zoomTop = zoomBottom+2;

	if(isNav && !isNav4)
	boxIt(zoomLeft,zoomBottom,zoomRight,zoomTop);
	else
	boxIt(ovhspc+zoomLeft,ovvspc+zoomBottom,ovhspc+zoomRight,ovvspc+zoomTop);
}

function getMapXFromImgX(x) {
	return (ovmapXMin + x*ovmapWidth/ovimgWidth);
}

function getMapYFromImgY(y) {
	return (ovmapYMin+(ovimgHeight-y)*ovmapHeight/ovimgHeight);
}

function zoom(x1,y1,x2,y2) {
	//calculer les coordonnées "terrain" et les transmettre à la carte principale
	X1 = getMapXFromImgX(x1-hspc);
	Y1 = getMapYFromImgY(y1-vspc);
	X2 = getMapXFromImgX(x2-hspc);
	Y2 = getMapYFromImgY(y2-vspc);
	parent.processmap.doAction('cadrer',X1,Y1,X2,Y2);	
}

function getImageSrc() {
	if(isNav4) return document.layers["theMap"].document.images["theImageMap"].src;
	else return document.images["theImageMap"].src
}

function getVars() {
	returnString  = 'ovimgWidth='+ovimgWidth+'&';
	returnString += 'ovimgHeight='+ovimgHeight+'&';
	returnString += 'ovmapXMin='+ovmapXMin+'&';
	returnString += 'ovmapYMin='+ovmapYMin+'&';
	returnString += 'ovmapWidth='+ovmapWidth+'&';
	returnString += 'ovmapHeight='+ovmapHeight+'&';
	returnString += 'ovimgURL='+getImageSrc();
	
	return returnString;
}

function createOverviewMap() {
	var content = '<img name="theImageMap" src="img/ovmap.png" hspace=0 vspace=0 border=0 WIDTH=' + ovimgWidth + ' HEIGHT=' + ovimgHeight + '> ';
	createLayer("theMap",ovhspc,ovvspc,ovimgWidth+ovhspc,ovimgHeight+ovvspc,true,content);
		
	
	if (is5up && isNav) {
		// zoom/selection box pour NS > 5
		content = '<img name="zoomImageTop" src="img/RedULcorner.gif" width=8 height=8 HSPACE=0 VSPACE=0 BORDER=0 ALT="">';
		createLayer("zoomBoxTop",0,0,8,8,false,content);
		content = '<img name="zoomImageLeft" src="img/RedLLcorner.gif" width=8 height=8 HSPACE=0 VSPACE=0 BORDER=0 ALT="">';
		createLayer("zoomBoxLeft",0,0,8,8,false,content);
		content = '<img name="zoomImageRight" src="img/RedURcorner.gif" width=8 height=8 HSPACE=0 VSPACE=0 BORDER=0 ALT="">';
		createLayer("zoomBoxRight",0,0,8,8,false,content);
		content = '<img name="zoomImageBottom" src="img/RedLRcorner.gif" width=8 height=8 HSPACE=0 VSPACE=0 BORDER=0 ALT="">';
		createLayer("zoomBoxBottom",0,0,8,8,false,content);
	} else {
		// zoom/selection box pour NS4 et IE
		content = '<img name="zoomImageTop" src="img/pixel.gif" width=1 height=1>';
		createLayer("zoomBoxTop",0,0,ovimgWidth+ovhspc+ovBoxSize+1,ovimgHeight+ovvspc+ovBoxSize,true,content);
		content = '<img name="zoomImageLeft" src="img/pixel.gif" width=1 height=1>';
		createLayer("zoomBoxLeft",0,0,ovimgWidth+ovhspc+ovBoxSize+1,ovimgHeight+ovvspc+ovBoxSize,true,content);
		content = '<img name="zoomImageRight" src="img/pixel.gif" width=1 height=1>';
		createLayer("zoomBoxRight",0,0,ovimgWidth+ovhspc+ovBoxSize+1,ovimgHeight+ovvspc+ovBoxSize,true,content);
		content = '<img name="zoomImageBottom" src="img/pixel.gif" width=1 height=1>';
		createLayer("zoomBoxBottom",0,0,ovimgWidth+ovhspc+ovBoxSize+1,ovimgHeight+ovvspc+ovBoxSize,true,content);
		// set zoom box color
		setLayerBackgroundColor("zoomBoxTop", ovzoomBoxColor);
		setLayerBackgroundColor("zoomBoxLeft", ovzoomBoxColor);
		setLayerBackgroundColor("zoomBoxRight", ovzoomBoxColor);
		setLayerBackgroundColor("zoomBoxBottom", ovzoomBoxColor);
	}  
	boxIt(-cornerOffset,-cornerOffset,-cornerOffset,-cornerOffset);

	ovStartUp();
}