function expandProjectPhoto(strPhotoId) {
	// This will hide all large images
	hideLargePhotos();
	document.getElementById(strPhotoId).style.display = 'block';
}

//Create an array 
var allPageTags = new Array(); 

function hideLargePhotos() {
	//Populate the array with all the page tags
	var allPageTags=document.getElementsByTagName("*");
	//Cycle through the tags using a for loop
	for (i=0; i<allPageTags.length; i++) {
		//Pick out the tags with our class name
		if (allPageTags[i].className=='largeProjectPhoto') {
			//Manipulate this in whatever way you want
			allPageTags[i].style.display='none';
		}
	}
}