function changeBG(newElement,newImage){
	var theImage = newImage;
	var theElement = document.getElementById(newElement);
	theElement.style.backgroundImage="url(" + theImage + ")";
}

function addedCheckHeights() {
	adjustHeights( "subcontainer" );
	adjustHeights( "container" );
}

function adjustHeights( classId ) {
	var divs,contDivs,maxHeight,divHeight,d;
	// get all <div> elements in the document
	divs=document.getElementsByTagName('div');
	contDivs=[];
	// initialize maximum height value
	maxHeight=0;
	// iterate over all <div> elements in the document
	for(var i=0;i<divs.length;i++){
  	// make collection with <div> elements with class attribute 'container'
    if( classId == divs[i].className){
			d=divs[i];
			contDivs[contDivs.length]=d;
			// determine height for <div> element
			if(d.offsetHeight){
				divHeight=d.offsetHeight;
			} 
			else if(d.style.pixelHeight){
					divHeight=d.style.pixelHeight;
				}
			// calculate maximum height
			maxHeight=Math.max(maxHeight,divHeight);
		}
	}
	// assign maximum height value to all of container <div> elements
	for(var i=0;i<contDivs.length;i++){
		if( classId == "container" ) {
			if( contDivs[i].id == "column_3" ) { contDivs[i].style.height=(maxHeight-15)+"px"; }
			else if ( contDivs[i].id == "column_4" ) { contDivs[i].style.height=(maxHeight-14)+"px"; }
			else { contDivs[i].style.height=(maxHeight-8)+"px"; }
		} else {
			contDivs[i].style.height=maxHeight+"px";
		}
		//contDivs[i].style.maxHeight=maxHeight;
		//contDivs[i].style.minHeight=maxHeight;
	}
}