if(document.images){
		mouseOverArray = new Array();
		// preload image 1
		mouseOverArray["but1_off"] = new Image(180, 55);
		mouseOverArray["but1_off"].src = "Images/EnvDrill_H.gif";
		mouseOverArray["but1_on"] = new Image(180, 55);
		mouseOverArray["but1_on"].src = "Images/EnvDrill_H-over.gif";
		mouseOverArray["but1_text"] = " ";

		// preload image 2
		mouseOverArray["but2_off"] = new Image(180, 45);
		mouseOverArray["but2_off"].src = "Images/GeoProbe_H.gif";
		mouseOverArray["but2_on"] = new Image(180, 45);
		mouseOverArray["but2_on"].src = "Images/GeoProbe_H-over.gif";
		mouseOverArray["but2_text"] = " ";

		// preload image 3
		mouseOverArray["but3_off"] = new Image(180, 50);
		mouseOverArray["but3_off"].src = "Images/AirVac_H.gif";
		mouseOverArray["but3_on"] = new Image(180, 50);
		mouseOverArray["but3_on"].src = "Images/AirVac_H-over.gif";
		mouseOverArray["but3_text"] = " ";

		// preload image 4
		mouseOverArray["but4_off"] = new Image(180, 50);
		mouseOverArray["but4_off"].src = "Images/SpeclDrill_H.gif";
		mouseOverArray["but4_on"] = new Image(180, 50);
		mouseOverArray["but4_on"].src = "Images/SpeclDrill_H-over.gif";
		mouseOverArray["but4_text"] = " ";

		// preload image 5
		mouseOverArray["but5_off"] = new Image(180, 40);
		mouseOverArray["but5_off"].src = "Images/EnvConstr_H.gif";
		mouseOverArray["but5_on"] = new Image(180, 40);
		mouseOverArray["but5_on"].src = "Images/EnvConstr_H-over.gif";
		mouseOverArray["but5_text"] = " ";

		// preload image 6
		mouseOverArray["but6_off"] = new Image(180, 50);
		mouseOverArray["but6_off"].src = "Images/EnvDrill_B.gif";
		mouseOverArray["but6_on"] = new Image(180, 50);
		mouseOverArray["but6_on"].src = "Images/EnvDrill_B-over.gif";
		mouseOverArray["but6_text"] = " ";

		// preload image 7
		mouseOverArray["but7_off"] = new Image(180, 50);
		mouseOverArray["but7_off"].src = "Images/GeoProbe_B.gif";
		mouseOverArray["but7_on"] = new Image(180, 50);
		mouseOverArray["but7_on"].src = "Images/GeoProbe_B-over.gif";
		mouseOverArray["but7_text"] = " ";

		// preload image 8
		mouseOverArray["but8_off"] = new Image(180, 40);
		mouseOverArray["but8_off"].src = "Images/AirVac_B.gif";
		mouseOverArray["but8_on"] = new Image(180, 40);
		mouseOverArray["but8_on"].src = "Images/AirVac_B-over.gif";
		mouseOverArray["but8_text"] = " ";

		// preload image 9
		mouseOverArray["but9_off"] = new Image(180, 50);
		mouseOverArray["but9_off"].src = "Images/SpeclDrill_B.gif";
		mouseOverArray["but9_on"] = new Image(180, 50);
		mouseOverArray["but9_on"].src = "Images/SpeclDrill_B-over.gif";
		mouseOverArray["but9_text"] = " ";
		
		// preload image 10
		mouseOverArray["but10_off"] = new Image(180, 40);
		mouseOverArray["but10_off"].src = "Images/EnvConstr_B.gif";
		mouseOverArray["but10_on"] = new Image(180, 40);
		mouseOverArray["but10_on"].src = "Images/EnvConstr_B-over.gif";
		mouseOverArray["but10_text"] = " ";
		
		// preload image 11
		mouseOverArray["but11_off"] = new Image(180, 40);
		mouseOverArray["but11_off"].src = "Images/Proposal.gif";
		mouseOverArray["but11_on"] = new Image(180, 40);
		mouseOverArray["but11_on"].src = "Images/Proposal-over.gif";
		mouseOverArray["but11_text"] = " ";
		
		// preload image 12
		mouseOverArray["but12_off"] = new Image(180, 40);
		mouseOverArray["but12_off"].src = "Images/RequestProposal_H.gif";
		mouseOverArray["but12_on"] = new Image(180, 40);
		mouseOverArray["but12_on"].src = "Images/RequestProposal_H-over.gif";
		mouseOverArray["but12_text"] = " ";
		
		// preload image 13
		mouseOverArray["but13_off"] = new Image(180, 40);
		mouseOverArray["but13_off"].src = "Images/CND_H.gif";
		mouseOverArray["but13_on"] = new Image(180, 40);
		mouseOverArray["but13_on"].src = "Images/CND_H-over.gif";
		mouseOverArray["but13_text"] = " ";
		
		// preload image 14
		mouseOverArray["but14_off"] = new Image(180, 50);
		mouseOverArray["but14_off"].src = "Images/CND_B.gif";
		mouseOverArray["but14_on"] = new Image(180, 50);
		mouseOverArray["but14_on"].src = "Images/CND_B-over.gif";
		mouseOverArray["but14_text"] = " ";
		
		// preload image 15
		mouseOverArray["but15_off"] = new Image(180, 50);
		mouseOverArray["but15_off"].src = "Images/ED_H.gif";
		mouseOverArray["but15_on"] = new Image(180, 50);
		mouseOverArray["but15_on"].src = "Images/ED_H-over.gif";
		mouseOverArray["but15_text"] = " ";
		
		// preload image 16
		mouseOverArray["but16_off"] = new Image(180, 50);
		mouseOverArray["but16_off"].src = "Images/ED_B.gif";
		mouseOverArray["but16_on"] = new Image(180, 50);
		mouseOverArray["but16_on"].src = "Images/ED_B-over.gif";
		mouseOverArray["but16_text"] = " ";

	}
	function doMouseOver( imgName, state ) {
		// performs mouseover image and status bar text swapping
		// imgName is the HTML image name specified in the <img> tag
		// state must be on, off or down
			// hide from browsers that don't support the image object
			if ( !document.images )
				return false;
		// replace image
		document.images[ imgName ].src = mouseOverArray[ imgName + "_" + state ].src;
		// if needed, display or clear the status bar text
		if ( mouseOverArray[ imgName + "_text" ] != "" ) {
			if ( state != "off" ) {
				window.status = mouseOverArray[ imgName + "_text" ];
				return true; //supresses display of link URL in on MouseOver
			} else {
				window.status = "";
				return false;
			}
		}
		return false;
	}
// -->