我找了下这方面的资料,应该能说明你的问题
你用的是DBL双精度,用SGL改为单精度
我把你的程式改过了,你可以看下
<img src="attachments/dvbbs/2006-7/200671223403083441.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2006-7/200671223403083441.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />